81363213290 has 96 divisors (see below), whose sum is σ = 157347235584. Its totient is φ = 30284349440.

The previous prime is 81363213263. The next prime is 81363213311. The reversal of 81363213290 is 9231236318.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 126931370 + ... + 126932010.

It is an arithmetic number, because the mean of its divisors is an integer number (1639033704).

Almost surely, 2^81363213290 is an apocalyptic number.

81363213290 is a deficient number, since it is larger than the sum of its proper divisors (75984022294).

81363213290 is a wasteful number, since it uses less digits than its factorization.

81363213290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 81363213290 in words is "eighty-one billion, three hundred sixty-three million, two hundred thirteen thousand, two hundred ninety".