251551005440052 has 96 divisors (see below), whose sum is σ = 658424561356800. Its totient is φ = 74366702543232.

The previous prime is 251551005439999. The next prime is 251551005440123. The reversal of 251551005440052 is 250044500155152.

It is a happy number.

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, 510065227 + ... + 510558162.

It is an arithmetic number, because the mean of its divisors is an integer number (6858589180800).

Almost surely, 2^{251551005440052} is an apocalyptic number.

It is an amenable number.

251551005440052 is an abundant number, since it is smaller than the sum of its proper divisors (406873555916748).

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

251551005440052 is a wasteful number, since it uses less digits than its factorization.

251551005440052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020623485 (or 1020623483 counting only the distinct ones).

The product of its (nonzero) digits is 200000, while the sum is 39.

The spelling of 251551005440052 in words is "two hundred fifty-one trillion, five hundred fifty-one billion, five million, four hundred forty thousand, fifty-two".