81090831076 has 6 divisors (see below), whose sum is σ = 141908954390. Its totient is φ = 40545415536.

The previous prime is 81090831067. The next prime is 81090831103. The reversal of 81090831076 is 67013809018.

It can be written as a sum of positive squares in only one way, i.e., 79428148900 + 1662682176 = 281830^2 + 40776^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10136353881 + ... + 10136353888.

Almost surely, 2^81090831076 is an apocalyptic number.

It is an amenable number.

81090831076 is a deficient number, since it is larger than the sum of its proper divisors (60818123314).

81090831076 is a wasteful number, since it uses less digits than its factorization.

81090831076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20272707773 (or 20272707771 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 81090831076 in words is "eighty-one billion, ninety million, eight hundred thirty-one thousand, seventy-six".