81374766680 has 16 divisors (see below), whose sum is σ = 183093225120. Its totient is φ = 32549906656.

The previous prime is 81374766679. The next prime is 81374766689. The reversal of 81374766680 is 8666747318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81374766689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017184544 + ... + 1017184623.

It is an arithmetic number, because the mean of its divisors is an integer number (11443326570).

Almost surely, 2^81374766680 is an apocalyptic number.

It is an amenable number.

81374766680 is an abundant number, since it is smaller than the sum of its proper divisors (101718458440).

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

81374766680 is a wasteful number, since it uses less digits than its factorization.

81374766680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034369178 (or 2034369174 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 81374766680 in words is "eighty-one billion, three hundred seventy-four million, seven hundred sixty-six thousand, six hundred eighty".