256265633550 has 48 divisors (see below), whose sum is σ = 635879872512. Its totient is φ = 68300824800.

The previous prime is 256265633543. The next prime is 256265633573. The reversal of 256265633550 is 55336562652.

It is a self number, because there is not a number n which added to its sum of digits gives 256265633550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177486 + ... + 737585.

It is an arithmetic number, because the mean of its divisors is an integer number (13247497344).

Almost surely, 2^256265633550 is an apocalyptic number.

256265633550 is an abundant number, since it is smaller than the sum of its proper divisors (379614238962).

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

256265633550 is a wasteful number, since it uses less digits than its factorization.

256265633550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916953 (or 916948 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 48.

The spelling of 256265633550 in words is "two hundred fifty-six billion, two hundred sixty-five million, six hundred thirty-three thousand, five hundred fifty".