2155810712922 has 48 divisors (see below), whose sum is σ = 4843219949568. Its totient is φ = 692304282720.

The previous prime is 2155810712863. The next prime is 2155810712947. The reversal of 2155810712922 is 2292170185512.

It is a happy number.

2155810712922 is a `hidden beast` number, since 2 + 1 + 558 + 1 + 0 + 7 + 1 + 2 + 92 + 2 = 666.

It is a super-4 number, since 4×2155810712922⁴ (a number of 50 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8538033 + ... + 8786900.

It is an arithmetic number, because the mean of its divisors is an integer number (100900415616).

Almost surely, 2^{2155810712922} is an apocalyptic number.

2155810712922 is an abundant number, since it is smaller than the sum of its proper divisors (2687409236646).

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

2155810712922 is a wasteful number, since it uses less digits than its factorization.

2155810712922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17325195 (or 17325192 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 2155810712922 in words is "two trillion, one hundred fifty-five billion, eight hundred ten million, seven hundred twelve thousand, nine hundred twenty-two".