81037670012 has 12 divisors (see below), whose sum is σ = 152724839736. Its totient is φ = 37402001520.

The previous prime is 81037669991. The next prime is 81037670023. The reversal of 81037670012 is 21007673018.

It is a congruent number.

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, 779208314 + ... + 779208417.

It is an arithmetic number, because the mean of its divisors is an integer number (12727069978).

Almost surely, 2^81037670012 is an apocalyptic number.

It is an amenable number.

81037670012 is a deficient number, since it is larger than the sum of its proper divisors (71687169724).

81037670012 is a wasteful number, since it uses less digits than its factorization.

81037670012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558416748 (or 1558416746 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 81037670012 in words is "eighty-one billion, thirty-seven million, six hundred seventy thousand, twelve".