1639520049672 has 36 divisors (see below), whose sum is σ = 4440396227085. Its totient is φ = 546503061600.

The previous prime is 1639520049667. The next prime is 1639520049677. The reversal of 1639520049672 is 2769400259361.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1639520049672 is a `hidden beast` number, since 1 + 6 + 3 + 9 + 520 + 0 + 49 + 6 + 72 = 666.

It is an interprime number because it is at equal distance from previous prime (1639520049667) and next prime (1639520049677).

It can be written as a sum of positive squares in 2 ways, for example, as 1548396967716 + 91123081956 = 1244346^2 + 301866^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=905406.

It is not an unprimeable number, because it can be changed into a prime (1639520049677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10789422 + ... + 10940322.

Almost surely, 2^{1639520049672} is an apocalyptic number.

1639520049672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1639520049672 is an abundant number, since it is smaller than the sum of its proper divisors (2800876177413).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1639520049672 is an frugal number, since it uses more digits than its factorization.

1639520049672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301814 (or 150906 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 1639520049672 in words is "one trillion, six hundred thirty-nine billion, five hundred twenty million, forty-nine thousand, six hundred seventy-two".