81690802264 has 32 divisors (see below), whose sum is σ = 158593590000. Its totient is φ = 39401695872.

The previous prime is 81690802261. The next prime is 81690802283. The reversal of 81690802264 is 46220809618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81690802261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103762 + ... + 417310.

Almost surely, 2^81690802264 is an apocalyptic number.

It is an amenable number.

81690802264 is a deficient number, since it is larger than the sum of its proper divisors (76902787736).

81690802264 is a wasteful number, since it uses less digits than its factorization.

81690802264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314707 (or 314703 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 81690802264 in words is "eighty-one billion, six hundred ninety million, eight hundred two thousand, two hundred sixty-four".