256011263988 has 48 divisors (see below), whose sum is σ = 628980656640. Its totient is φ = 80822383200.

The previous prime is 256011263953. The next prime is 256011263999. The reversal of 256011263988 is 889362110652.

It is a self number, because there is not a number n which added to its sum of digits gives 256011263988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640603 + ... + 960413.

It is an arithmetic number, because the mean of its divisors is an integer number (13103763680).

Almost surely, 2^256011263988 is an apocalyptic number.

It is an amenable number.

256011263988 is an abundant number, since it is smaller than the sum of its proper divisors (372969392652).

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

256011263988 is a wasteful number, since it uses less digits than its factorization.

256011263988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323348 (or 323346 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 256011263988 in words is "two hundred fifty-six billion, eleven million, two hundred sixty-three thousand, nine hundred eighty-eight".