55197990912 has 256 divisors, whose sum is σ = 155019110400. Its totient is φ = 17446993920.

The previous prime is 55197990899. The next prime is 55197990919. The reversal of 55197990912 is 21909979155.

It is a tau number, because it is divible by the number of its divisors (256).

It is not an unprimeable number, because it can be changed into a prime (55197990919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179797863 + ... + 179798169.

It is an arithmetic number, because the mean of its divisors is an integer number (605543400).

Almost surely, 2^55197990912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55197990912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77509555200).

55197990912 is an abundant number, since it is smaller than the sum of its proper divisors (99821119488).

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

55197990912 is an equidigital number, since it uses as much as digits as its factorization.

55197990912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 2296350, while the sum is 57.

The spelling of 55197990912 in words is "fifty-five billion, one hundred ninety-seven million, nine hundred ninety thousand, nine hundred twelve".