1555220016072 has 80 divisors (see below), whose sum is σ = 4448738194560. Its totient is φ = 507376732896.

The previous prime is 1555220016047. The next prime is 1555220016079. The reversal of 1555220016072 is 2706100225551.

1555220016072 is a `hidden beast` number, since 1 + 5 + 5 + 522 + 0 + 0 + 1 + 60 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1555220016079) 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 19 ways as a sum of consecutive naturals, for example, 25501788 + ... + 25562699.

It is an arithmetic number, because the mean of its divisors is an integer number (55609227432).

Almost surely, 2^{1555220016072} is an apocalyptic number.

1555220016072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1555220016072 is an abundant number, since it is smaller than the sum of its proper divisors (2893518178488).

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

1555220016072 is a wasteful number, since it uses less digits than its factorization.

1555220016072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51064552 (or 51064539 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 1555220016072 in words is "one trillion, five hundred fifty-five billion, two hundred twenty million, sixteen thousand, seventy-two".