521623304613 has 6 divisors (see below), whose sum is σ = 753455884454. Its totient is φ = 347748869736.

The previous prime is 521623304563. The next prime is 521623304669. The reversal of 521623304613 is 316403326125.

521623304613 is a `hidden beast` number, since 5 + 2 + 1 + 6 + 2 + 3 + 30 + 4 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 427378602564 + 94244702049 = 653742^2 + 306993^2 .

It is not a de Polignac number, because 521623304613 - 2¹⁸ = 521623042469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521623304693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28979072470 + ... + 28979072487.

Almost surely, 2^521623304613 is an apocalyptic number.

It is an amenable number.

521623304613 is a deficient number, since it is larger than the sum of its proper divisors (231832579841).

521623304613 is a wasteful number, since it uses less digits than its factorization.

521623304613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57958144963 (or 57958144960 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 521623304613 in words is "five hundred twenty-one billion, six hundred twenty-three million, three hundred four thousand, six hundred thirteen".