2158513078188 has 12 divisors (see below), whose sum is σ = 5036530515800. Its totient is φ = 719504359392.

The previous prime is 2158513078181. The next prime is 2158513078201. The reversal of 2158513078188 is 8818703158512.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (2158513078181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89938044913 + ... + 89938044936.

Almost surely, 2^{2158513078188} is an apocalyptic number.

It is an amenable number.

2158513078188 is an abundant number, since it is smaller than the sum of its proper divisors (2878017437612).

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

2158513078188 is a wasteful number, since it uses less digits than its factorization.

2158513078188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179876089856 (or 179876089854 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 57.

The spelling of 2158513078188 in words is "two trillion, one hundred fifty-eight billion, five hundred thirteen million, seventy-eight thousand, one hundred eighty-eight".