2155168124865 has 96 divisors (see below), whose sum is σ = 4411266662400. Its totient is φ = 952516298880.

The previous prime is 2155168124789. The next prime is 2155168124899. The reversal of 2155168124865 is 5684218615512.

It is a happy number.

2155168124865 is a `hidden beast` number, since 2 + 1 + 5 + 516 + 81 + 2 + 48 + 6 + 5 = 666.

It is not a de Polignac number, because 2155168124865 - 2⁷ = 2155168124737 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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 95 ways as a sum of consecutive naturals, for example, 10039626 + ... + 10252044.

It is an arithmetic number, because the mean of its divisors is an integer number (45950694400).

Almost surely, 2^{2155168124865} is an apocalyptic number.

It is an amenable number.

2155168124865 is an abundant number, since it is smaller than the sum of its proper divisors (2256098537535).

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

2155168124865 is a wasteful number, since it uses less digits than its factorization.

2155168124865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213507 (or 213504 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 54.

The spelling of 2155168124865 in words is "two trillion, one hundred fifty-five billion, one hundred sixty-eight million, one hundred twenty-four thousand, eight hundred sixty-five".