64561920694 has 8 divisors (see below), whose sum is σ = 101939874840. Its totient is φ = 30581962416.

The previous prime is 64561920677. The next prime is 64561920701. The reversal of 64561920694 is 49602916546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 849498919 + ... + 849498994.

It is an arithmetic number, because the mean of its divisors is an integer number (12742484355).

Almost surely, 2^64561920694 is an apocalyptic number.

64561920694 is a deficient number, since it is larger than the sum of its proper divisors (37377954146).

64561920694 is a wasteful number, since it uses less digits than its factorization.

64561920694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698997934.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 64561920694 in words is "sixty-four billion, five hundred sixty-one million, nine hundred twenty thousand, six hundred ninety-four".