81964075076 has 48 divisors (see below), whose sum is σ = 155253857136. Its totient is φ = 37638203904.

The previous prime is 81964075031. The next prime is 81964075117. The reversal of 81964075076 is 67057046918.

It can be written as a sum of positive squares in 8 ways, for example, as 196672576 + 81767402500 = 14024^2 + 285950^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10900070 + ... + 10907586.

It is an arithmetic number, because the mean of its divisors is an integer number (3234455357).

Almost surely, 2^81964075076 is an apocalyptic number.

It is an amenable number.

81964075076 is a deficient number, since it is larger than the sum of its proper divisors (73289782060).

81964075076 is a wasteful number, since it uses less digits than its factorization.

81964075076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8568 (or 8566 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 81964075076 in words is "eighty-one billion, nine hundred sixty-four million, seventy-five thousand, seventy-six".