251240663155 has 8 divisors (see below), whose sum is σ = 301509588384. Its totient is φ = 200978668800.

The previous prime is 251240663123. The next prime is 251240663159. The reversal of 251240663155 is 551366042152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251240663155 - 2⁵ = 251240663123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251240663159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652631 + ... + 1798240.

It is an arithmetic number, because the mean of its divisors is an integer number (37688698548).

Almost surely, 2^251240663155 is an apocalyptic number.

251240663155 is a deficient number, since it is larger than the sum of its proper divisors (50268925229).

251240663155 is a wasteful number, since it uses less digits than its factorization.

251240663155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465437.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 251240663155 in words is "two hundred fifty-one billion, two hundred forty million, six hundred sixty-three thousand, one hundred fifty-five".