251501051052 has 18 divisors (see below), whose sum is σ = 635738768028. Its totient is φ = 83833683672.

The previous prime is 251501051051. The next prime is 251501051059. The reversal of 251501051052 is 250150105152.

251501051052 is a `hidden beast` number, since 2 + 51 + 50 + 1 + 0 + 510 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (251501051051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3493070118 + ... + 3493070189.

It is an arithmetic number, because the mean of its divisors is an integer number (35318820446).

Almost surely, 2^251501051052 is an apocalyptic number.

It is an amenable number.

251501051052 is an abundant number, since it is smaller than the sum of its proper divisors (384237716976).

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

251501051052 is a wasteful number, since it uses less digits than its factorization.

251501051052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986140317 (or 6986140312 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 251501051052 in words is "two hundred fifty-one billion, five hundred one million, fifty-one thousand, fifty-two".