81126632836 has 24 divisors (see below), whose sum is σ = 147974188544. Its totient is φ = 38873701440.

The previous prime is 81126632827. The next prime is 81126632849. The reversal of 81126632836 is 63823662118.

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, 3163185 + ... + 3188728.

Almost surely, 2^81126632836 is an apocalyptic number.

It is an amenable number.

81126632836 is a deficient number, since it is larger than the sum of its proper divisors (66847555708).

81126632836 is a wasteful number, since it uses less digits than its factorization.

81126632836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6352051 (or 6352049 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The spelling of 81126632836 in words is "eighty-one billion, one hundred twenty-six million, six hundred thirty-two thousand, eight hundred thirty-six".