521261260256 has 48 divisors (see below), whose sum is σ = 1121770944000. Its totient is φ = 236462033280.

The previous prime is 521261260237. The next prime is 521261260259. The reversal of 521261260256 is 652062162125.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521261260259) by changing a digit.

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, 1308176 + ... + 1659471.

It is an arithmetic number, because the mean of its divisors is an integer number (23370228000).

Almost surely, 2^521261260256 is an apocalyptic number.

It is an amenable number.

521261260256 is an abundant number, since it is smaller than the sum of its proper divisors (600509683744).

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

521261260256 is a wasteful number, since it uses less digits than its factorization.

521261260256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968167 (or 2968159 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 521261260256 in words is "five hundred twenty-one billion, two hundred sixty-one million, two hundred sixty thousand, two hundred fifty-six".