521634376425694 has 64 divisors (see below), whose sum is σ = 909342775296000. Its totient is φ = 219810811824000.

The previous prime is 521634376425661. The next prime is 521634376425797. The reversal of 521634376425694 is 496524673436125.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 977105499 + ... + 977639209.

It is an arithmetic number, because the mean of its divisors is an integer number (14208480864000).

Almost surely, 2^{521634376425694} is an apocalyptic number.

521634376425694 is a deficient number, since it is larger than the sum of its proper divisors (387708398870306).

521634376425694 is a wasteful number, since it uses less digits than its factorization.

521634376425694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538609.

The product of its digits is 783820800, while the sum is 67.

The spelling of 521634376425694 in words is "five hundred twenty-one trillion, six hundred thirty-four billion, three hundred seventy-six million, four hundred twenty-five thousand, six hundred ninety-four".