251445513256 has 16 divisors (see below), whose sum is σ = 538811814240. Its totient is φ = 107762362800.

The previous prime is 251445513247. The next prime is 251445513257. The reversal of 251445513256 is 652315544152.

It is a super-2 number, since 2×251445513256² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251445513257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2245049170 + ... + 2245049281.

It is an arithmetic number, because the mean of its divisors is an integer number (33675738390).

Almost surely, 2^251445513256 is an apocalyptic number.

It is an amenable number.

251445513256 is an abundant number, since it is smaller than the sum of its proper divisors (287366300984).

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

251445513256 is a wasteful number, since it uses less digits than its factorization.

251445513256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490098464 (or 4490098460 counting only the distinct ones).

The product of its digits is 720000, while the sum is 43.

The spelling of 251445513256 in words is "two hundred fifty-one billion, four hundred forty-five million, five hundred thirteen thousand, two hundred fifty-six".