251245225550 has 24 divisors (see below), whose sum is σ = 509799404232. Its totient is φ = 91361900000.

The previous prime is 251245225541. The next prime is 251245225573. The reversal of 251245225550 is 55522542152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228404201 + ... + 228405300.

It is an arithmetic number, because the mean of its divisors is an integer number (21241641843).

Almost surely, 2^251245225550 is an apocalyptic number.

251245225550 is an abundant number, since it is smaller than the sum of its proper divisors (258554178682).

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

251245225550 is a wasteful number, since it uses less digits than its factorization.

251245225550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456809524 (or 456809519 counting only the distinct ones).

The product of its (nonzero) digits is 200000, while the sum is 38.

The spelling of 251245225550 in words is "two hundred fifty-one billion, two hundred forty-five million, two hundred twenty-five thousand, five hundred fifty".