5256121556 has 12 divisors (see below), whose sum is σ = 10512243168. Its totient is φ = 2252623512.

The previous prime is 5256121537. The next prime is 5256121561. The reversal of 5256121556 is 6551216525.

5256121556 is an admirable number.

It is a super-2 number, since 2×5256121556² = 55253627622895722272, which contains 22 as substring.

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, 93859286 + ... + 93859341.

It is an arithmetic number, because the mean of its divisors is an integer number (876020264).

Almost surely, 2^5256121556 is an apocalyptic number.

It is an amenable number.

5256121556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

5256121556 is a wasteful number, since it uses less digits than its factorization.

5256121556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187718638 (or 187718636 counting only the distinct ones).

The product of its digits is 90000, while the sum is 38.

The square root of 5256121556 is about 72499.1141738987. The cubic root of 5256121556 is about 1738.6885740852.

The spelling of 5256121556 in words is "five billion, two hundred fifty-six million, one hundred twenty-one thousand, five hundred fifty-six".