81177097522 has 16 divisors (see below), whose sum is σ = 122928376032. Its totient is φ = 40201470400.

The previous prime is 81177097513. The next prime is 81177097537. The reversal of 81177097522 is 22579077118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204153 + ... + 451699.

It is an arithmetic number, because the mean of its divisors is an integer number (7683023502).

Almost surely, 2^81177097522 is an apocalyptic number.

81177097522 is a deficient number, since it is larger than the sum of its proper divisors (41751278510).

81177097522 is a wasteful number, since it uses less digits than its factorization.

81177097522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249113.

The product of its (nonzero) digits is 493920, while the sum is 49.

The spelling of 81177097522 in words is "eighty-one billion, one hundred seventy-seven million, ninety-seven thousand, five hundred twenty-two".