55721000165 has 16 divisors (see below), whose sum is σ = 68317136640. Its totient is φ = 43609656000.

The previous prime is 55721000099. The next prime is 55721000213. The reversal of 55721000165 is 56100012755.

It is a de Polignac number, because none of the positive numbers 2^k-55721000165 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 511790 + ... + 611040.

It is an arithmetic number, because the mean of its divisors is an integer number (4269821040).

Almost surely, 2^55721000165 is an apocalyptic number.

It is an amenable number.

55721000165 is a deficient number, since it is larger than the sum of its proper divisors (12596136475).

55721000165 is a wasteful number, since it uses less digits than its factorization.

55721000165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101692.

The product of its (nonzero) digits is 10500, while the sum is 32.

The spelling of 55721000165 in words is "fifty-five billion, seven hundred twenty-one million, one hundred sixty-five", and thus it is an aban number.