521253716057 has 4 divisors (see below), whose sum is σ = 521315550336. Its totient is φ = 521191881780.

The previous prime is 521253716041. The next prime is 521253716077. The reversal of 521253716057 is 750617352125.

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 a cyclic number.

It is not a de Polignac number, because 521253716057 - 2⁴ = 521253716041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521253715999 and 521253716017.

It is not an unprimeable number, because it can be changed into a prime (521253716017) by changing a digit.

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, 30904493 + ... + 30921354.

It is an arithmetic number, because the mean of its divisors is an integer number (130328887584).

Almost surely, 2^521253716057 is an apocalyptic number.

It is an amenable number.

521253716057 is a deficient number, since it is larger than the sum of its proper divisors (61834279).

521253716057 is an equidigital number, since it uses as much as digits as its factorization.

521253716057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61834278.

The product of its (nonzero) digits is 441000, while the sum is 44.

The spelling of 521253716057 in words is "five hundred twenty-one billion, two hundred fifty-three million, seven hundred sixteen thousand, fifty-seven".