256521445352 has 16 divisors (see below), whose sum is σ = 480988864800. Its totient is φ = 128257748080.

The previous prime is 256521445339. The next prime is 256521445373. The reversal of 256521445352 is 253544125652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18827 + ... + 716517.

It is an arithmetic number, because the mean of its divisors is an integer number (30061804050).

Almost surely, 2^256521445352 is an apocalyptic number.

It is an amenable number.

256521445352 is a deficient number, since it is larger than the sum of its proper divisors (224467419448).

256521445352 is a wasteful number, since it uses less digits than its factorization.

256521445352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743656 (or 743652 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 44.

The spelling of 256521445352 in words is "two hundred fifty-six billion, five hundred twenty-one million, four hundred forty-five thousand, three hundred fifty-two".