521700670052 has 6 divisors (see below), whose sum is σ = 912976172598. Its totient is φ = 260850335024.

The previous prime is 521700670039. The next prime is 521700670081. The reversal of 521700670052 is 250076007125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 376399428196 + 145301241856 = 613514^2 + 381184^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521700669994 and 521700670021.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65212583753 + ... + 65212583760.

It is an arithmetic number, because the mean of its divisors is an integer number (152162695433).

Almost surely, 2^521700670052 is an apocalyptic number.

It is an amenable number.

521700670052 is a deficient number, since it is larger than the sum of its proper divisors (391275502546).

521700670052 is a wasteful number, since it uses less digits than its factorization.

521700670052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130425167517 (or 130425167515 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

Adding to 521700670052 its reverse (250076007125), we get a palindrome (771776677177).

The spelling of 521700670052 in words is "five hundred twenty-one billion, seven hundred million, six hundred seventy thousand, fifty-two".