2157715172555 has 32 divisors (see below), whose sum is σ = 2770200699840. Its totient is φ = 1607669268480.

The previous prime is 2157715172551. The next prime is 2157715172603. The reversal of 2157715172555 is 5552715177512.

It is not a de Polignac number, because 2157715172555 - 2² = 2157715172551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2157715172497 and 2157715172506.

It is not an unprimeable number, because it can be changed into a prime (2157715172551) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 89784281 + ... + 89808309.

It is an arithmetic number, because the mean of its divisors is an integer number (86568771870).

Almost surely, 2^{2157715172555} is an apocalyptic number.

2157715172555 is a deficient number, since it is larger than the sum of its proper divisors (612485527285).

2157715172555 is a wasteful number, since it uses less digits than its factorization.

2157715172555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35039.

The product of its digits is 4287500, while the sum is 53.

The spelling of 2157715172555 in words is "two trillion, one hundred fifty-seven billion, seven hundred fifteen million, one hundred seventy-two thousand, five hundred fifty-five".