2158118177564 has 48 divisors (see below), whose sum is σ = 4067460956160. Its totient is φ = 998171016960.

The previous prime is 2158118177549. The next prime is 2158118177569. The reversal of 2158118177564 is 4657718118512.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158118177569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20919269 + ... + 21022179.

It is an arithmetic number, because the mean of its divisors is an integer number (84738769920).

Almost surely, 2^{2158118177564} is an apocalyptic number.

It is an amenable number.

2158118177564 is a deficient number, since it is larger than the sum of its proper divisors (1909342778596).

2158118177564 is a wasteful number, since it uses less digits than its factorization.

2158118177564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108218 (or 108216 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 56.

The spelling of 2158118177564 in words is "two trillion, one hundred fifty-eight billion, one hundred eighteen million, one hundred seventy-seven thousand, five hundred sixty-four".