521253513516 has 48 divisors (see below), whose sum is σ = 1226101201920. Its totient is φ = 172350689280.

The previous prime is 521253513439. The next prime is 521253513527. The reversal of 521253513516 is 615315352125.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383481 + ... + 1090671.

It is an arithmetic number, because the mean of its divisors is an integer number (25543775040).

Almost surely, 2^521253513516 is an apocalyptic number.

It is an amenable number.

521253513516 is an abundant number, since it is smaller than the sum of its proper divisors (704847688404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521253513516 is a wasteful number, since it uses less digits than its factorization.

521253513516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707694 (or 707692 counting only the distinct ones).

The product of its digits is 135000, while the sum is 39.

The spelling of 521253513516 in words is "five hundred twenty-one billion, two hundred fifty-three million, five hundred thirteen thousand, five hundred sixteen".