251255205030 has 64 divisors (see below), whose sum is σ = 607606272000. Its totient is φ = 66492708480.

The previous prime is 251255205013. The next prime is 251255205049. The reversal of 251255205030 is 30502552152.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2268235 + ... + 2376425.

It is an arithmetic number, because the mean of its divisors is an integer number (9493848000).

Almost surely, 2^251255205030 is an apocalyptic number.

251255205030 is an abundant number, since it is smaller than the sum of its proper divisors (356351066970).

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

251255205030 is a wasteful number, since it uses less digits than its factorization.

251255205030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108789.

The product of its (nonzero) digits is 15000, while the sum is 30.

Adding to 251255205030 its reverse (30502552152), we get a palindrome (281757757182).

The spelling of 251255205030 in words is "two hundred fifty-one billion, two hundred fifty-five million, two hundred five thousand, thirty".