256631552636 has 12 divisors (see below), whose sum is σ = 464591604120. Its totient is φ = 123891094320.

The previous prime is 256631552609. The next prime is 256631552663. The reversal of 256631552636 is 636255136652.

It is an interprime number because it is at equal distance from previous prime (256631552609) and next prime (256631552663).

It is a congruent 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, 1106170370 + ... + 1106170601.

It is an arithmetic number, because the mean of its divisors is an integer number (38715967010).

Almost surely, 2^256631552636 is an apocalyptic number.

It is an amenable number.

256631552636 is a deficient number, since it is larger than the sum of its proper divisors (207960051484).

256631552636 is a wasteful number, since it uses less digits than its factorization.

256631552636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212341004 (or 2212341002 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 50.

The spelling of 256631552636 in words is "two hundred fifty-six billion, six hundred thirty-one million, five hundred fifty-two thousand, six hundred thirty-six".