521525898057 has 8 divisors (see below), whose sum is σ = 695658944320. Its totient is φ = 347538391920.

The previous prime is 521525898007. The next prime is 521525898071. The reversal of 521525898057 is 750898525125.

It is a happy number.

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

It is not a de Polignac number, because 521525898057 - 2²⁸ = 521257462601 is a prime.

It is the 722168-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521525897988 and 521525898006.

It is not an unprimeable number, because it can be changed into a prime (521525898007) by changing a digit.

It is a nontrivial repunit in base 722167.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36376669 + ... + 36391002.

It is an arithmetic number, because the mean of its divisors is an integer number (86957368040).

Almost surely, 2^521525898057 is an apocalyptic number.

It is an amenable number.

521525898057 is a deficient number, since it is larger than the sum of its proper divisors (174133046263).

521525898057 is a wasteful number, since it uses less digits than its factorization.

521525898057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72770063.

The product of its (nonzero) digits is 10080000, while the sum is 57.

The spelling of 521525898057 in words is "five hundred twenty-one billion, five hundred twenty-five million, eight hundred ninety-eight thousand, fifty-seven".