81158353374 has 48 divisors (see below), whose sum is σ = 188950138128. Its totient is φ = 23171799168.

The previous prime is 81158353363. The next prime is 81158353399. The reversal of 81158353374 is 47335385118.

It is a Curzon number.

It is a congruent number.

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, 324984 + ... + 517620.

It is an arithmetic number, because the mean of its divisors is an integer number (3936461211).

Almost surely, 2^81158353374 is an apocalyptic number.

81158353374 is an abundant number, since it is smaller than the sum of its proper divisors (107791784754).

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

81158353374 is a wasteful number, since it uses less digits than its factorization.

81158353374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194089 (or 194082 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The spelling of 81158353374 in words is "eighty-one billion, one hundred fifty-eight million, three hundred fifty-three thousand, three hundred seventy-four".