81926502690 has 16 divisors (see below), whose sum is σ = 196623606528. Its totient is φ = 21847067376.

The previous prime is 81926502689. The next prime is 81926502701. The reversal of 81926502690 is 9620562918.

It is a super-2 number, since 2×81926502690² (a number of 23 digits) contains 22 as substring.

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, 1365441682 + ... + 1365441741.

It is an arithmetic number, because the mean of its divisors is an integer number (12288975408).

Almost surely, 2^81926502690 is an apocalyptic number.

81926502690 is an abundant number, since it is smaller than the sum of its proper divisors (114697103838).

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

81926502690 is a wasteful number, since it uses less digits than its factorization.

81926502690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730883433.

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 81926502690 in words is "eighty-one billion, nine hundred twenty-six million, five hundred two thousand, six hundred ninety".