81970113016 has 32 divisors (see below), whose sum is σ = 168146622000. Its totient is φ = 37152368640.

The previous prime is 81970113007. The next prime is 81970113023. The reversal of 81970113016 is 61031107918.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1303785 + ... + 1365208.

Almost surely, 2^81970113016 is an apocalyptic number.

It is an amenable number.

81970113016 is an abundant number, since it is smaller than the sum of its proper divisors (86176508984).

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

81970113016 is a wasteful number, since it uses less digits than its factorization.

81970113016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669359 (or 2669355 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 81970113016 in words is "eighty-one billion, nine hundred seventy million, one hundred thirteen thousand, sixteen".