251115044651 has 4 divisors (see below), whose sum is σ = 252041668704. Its totient is φ = 250188420600.

The previous prime is 251115044627. The next prime is 251115044669. The reversal of 251115044651 is 156440511152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251115044651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251115044351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463311620 + ... + 463312161.

It is an arithmetic number, because the mean of its divisors is an integer number (63010417176).

Almost surely, 2^251115044651 is an apocalyptic number.

251115044651 is a deficient number, since it is larger than the sum of its proper divisors (926624053).

251115044651 is an equidigital number, since it uses as much as digits as its factorization.

251115044651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926624052.

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 251115044651 in words is "two hundred fifty-one billion, one hundred fifteen million, forty-four thousand, six hundred fifty-one".