81964075075 has 6 divisors (see below), whose sum is σ = 101635453124. Its totient is φ = 65571260040.

The previous prime is 81964075031. The next prime is 81964075117. The reversal of 81964075075 is 57057046918.

It is not a de Polignac number, because 81964075075 - 2⁷ = 81964074947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1639281477 + ... + 1639281526.

Almost surely, 2^81964075075 is an apocalyptic number.

81964075075 is a deficient number, since it is larger than the sum of its proper divisors (19671378049).

81964075075 is a wasteful number, since it uses less digits than its factorization.

81964075075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278563013 (or 3278563008 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 81964075075 in words is "eighty-one billion, nine hundred sixty-four million, seventy-five thousand, seventy-five".