521464601613 has 4 divisors (see below), whose sum is σ = 695286135488. Its totient is φ = 347643067740.

The previous prime is 521464601587. The next prime is 521464601639. The reversal of 521464601613 is 316106464125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (521464601587) and next prime (521464601639).

It is not a de Polignac number, because 521464601613 - 2⁶ = 521464601549 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 (521464601663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86910766933 + ... + 86910766938.

It is an arithmetic number, because the mean of its divisors is an integer number (173821533872).

Almost surely, 2^521464601613 is an apocalyptic number.

It is an amenable number.

521464601613 is a deficient number, since it is larger than the sum of its proper divisors (173821533875).

521464601613 is a wasteful number, since it uses less digits than its factorization.

521464601613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173821533874.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 521464601613 in words is "five hundred twenty-one billion, four hundred sixty-four million, six hundred one thousand, six hundred thirteen".