81964396595 has 4 divisors (see below), whose sum is σ = 98357275920. Its totient is φ = 65571517272.

The previous prime is 81964396573. The next prime is 81964396607. The reversal of 81964396595 is 59569346918.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81964396595 - 2¹⁰ = 81964395571 is a prime.

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, 8196439655 + ... + 8196439664.

It is an arithmetic number, because the mean of its divisors is an integer number (24589318980).

Almost surely, 2^81964396595 is an apocalyptic number.

81964396595 is a deficient number, since it is larger than the sum of its proper divisors (16392879325).

81964396595 is a wasteful number, since it uses less digits than its factorization.

81964396595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16392879324.

The product of its digits is 62985600, while the sum is 65.

The spelling of 81964396595 in words is "eighty-one billion, nine hundred sixty-four million, three hundred ninety-six thousand, five hundred ninety-five".