1638665227120 has 20 divisors (see below), whose sum is σ = 3809896653240. Its totient is φ = 655466090816.

The previous prime is 1638665227109. The next prime is 1638665227163. The reversal of 1638665227120 is 217225668361.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10241657590 + ... + 10241657749.

It is an arithmetic number, because the mean of its divisors is an integer number (190494832662).

Almost surely, 2^{1638665227120} is an apocalyptic number.

1638665227120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638665227120 is an abundant number, since it is smaller than the sum of its proper divisors (2171231426120).

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

1638665227120 is a wasteful number, since it uses less digits than its factorization.

1638665227120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20483315352 (or 20483315346 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 1638665227120 in words is "one trillion, six hundred thirty-eight billion, six hundred sixty-five million, two hundred twenty-seven thousand, one hundred twenty".