81018808676 has 12 divisors (see below), whose sum is σ = 152689293372. Its totient is φ = 37393296288.

The previous prime is 81018808643. The next prime is 81018808681. The reversal of 81018808676 is 67680881018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29834271076 + 51184537600 = 172726^2 + 226240^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779026955 + ... + 779027058.

It is an arithmetic number, because the mean of its divisors is an integer number (12724107781).

Almost surely, 2^81018808676 is an apocalyptic number.

It is an amenable number.

81018808676 is a deficient number, since it is larger than the sum of its proper divisors (71670484696).

81018808676 is a wasteful number, since it uses less digits than its factorization.

81018808676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558054030 (or 1558054028 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 53.

The spelling of 81018808676 in words is "eighty-one billion, eighteen million, eight hundred eight thousand, six hundred seventy-six".