256748943616 has 81 divisors (see below), whose sum is σ = 563516641723. Its totient is φ = 116663528960.

The previous prime is 256748943593. The next prime is 256748943667. The reversal of 256748943616 is 616349847652.

The square root of 256748943616 is 506704.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 89178465 + ... + 89181343.

Almost surely, 2^256748943616 is an apocalyptic number.

256748943616 is the 506704-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256748943616

256748943616 is an abundant number, since it is smaller than the sum of its proper divisors (306767698107).

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

256748943616 is an frugal number, since it uses more digits than its factorization.

256748943616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796 (or 2892 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 61.

The spelling of 256748943616 in words is "two hundred fifty-six billion, seven hundred forty-eight million, nine hundred forty-three thousand, six hundred sixteen".