81157501758114 has 48 divisors (see below), whose sum is σ = 177818590436760. Its totient is φ = 26748300395520.

The previous prime is 81157501758079. The next prime is 81157501758143. The reversal of 81157501758114 is 41185710575118.

81157501758114 is a `hidden beast` number, since 8 + 1 + 1 + 5 + 7 + 50 + 1 + 7 + 581 + 1 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 68731644107025 + 12425857651089 = 8290455^2 + 3525033^2 .

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, 318415894 + ... + 318670670.

Almost surely, 2^{81157501758114} is an apocalyptic number.

81157501758114 is an abundant number, since it is smaller than the sum of its proper divisors (96661088678646).

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

81157501758114 is a wasteful number, since it uses less digits than its factorization.

81157501758114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453715 (or 453712 counting only the distinct ones).

The product of its (nonzero) digits is 1568000, while the sum is 54.

The spelling of 81157501758114 in words is "eighty-one trillion, one hundred fifty-seven billion, five hundred one million, seven hundred fifty-eight thousand, one hundred fourteen".