251375055550 has 24 divisors (see below), whose sum is σ = 475222487832. Its totient is φ = 98901660000.

The previous prime is 251375055511. The next prime is 251375055583. The reversal of 251375055550 is 55550573152.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 251375055497 and 251375055506.

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, 41205976 + ... + 41212075.

It is an arithmetic number, because the mean of its divisors is an integer number (19800936993).

Almost surely, 2^251375055550 is an apocalyptic number.

251375055550 is a deficient number, since it is larger than the sum of its proper divisors (223847432282).

251375055550 is a wasteful number, since it uses less digits than its factorization.

251375055550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82418124 (or 82418119 counting only the distinct ones).

The product of its (nonzero) digits is 656250, while the sum is 43.

The spelling of 251375055550 in words is "two hundred fifty-one billion, three hundred seventy-five million, fifty-five thousand, five hundred fifty".