81615072192 has 56 divisors (see below), whose sum is σ = 215992405200. Its totient is φ = 27198406656.

The previous prime is 81615072191. The next prime is 81615072211. The reversal of 81615072192 is 29127051618.

It is a super-2 number, since 2×81615072192² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81615072191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773934 + ... + 873042.

Almost surely, 2^81615072192 is an apocalyptic number.

It is an amenable number.

81615072192 is an abundant number, since it is smaller than the sum of its proper divisors (134377333008).

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

81615072192 is a wasteful number, since it uses less digits than its factorization.

81615072192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103413 (or 103403 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 81615072192 in words is "eighty-one billion, six hundred fifteen million, seventy-two thousand, one hundred ninety-two".