55197720972 has 48 divisors (see below), whose sum is σ = 145065568480. Its totient is φ = 18147193344.

The previous prime is 55197720913. The next prime is 55197721003. The reversal of 55197720972 is 27902779155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3492733 + ... + 3508500.

Almost surely, 2^55197720972 is an apocalyptic number.

It is an amenable number.

55197720972 is an abundant number, since it is smaller than the sum of its proper divisors (89867847508).

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

55197720972 is a wasteful number, since it uses less digits than its factorization.

55197720972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001319 (or 7001311 counting only the distinct ones).

The product of its (nonzero) digits is 2778300, while the sum is 54.

The spelling of 55197720972 in words is "fifty-five billion, one hundred ninety-seven million, seven hundred twenty thousand, nine hundred seventy-two".