251441968049 has 4 divisors (see below), whose sum is σ = 251573822064. Its totient is φ = 251310114036.

The previous prime is 251441968031. The next prime is 251441968061. The reversal of 251441968049 is 940869144152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251441968049 - 2²⁸ = 251173532593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251441968249) 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, 65924147 + ... + 65927960.

It is an arithmetic number, because the mean of its divisors is an integer number (62893455516).

Almost surely, 2^251441968049 is an apocalyptic number.

It is an amenable number.

251441968049 is a deficient number, since it is larger than the sum of its proper divisors (131854015).

251441968049 is a wasteful number, since it uses less digits than its factorization.

251441968049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131854014.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 251441968049 in words is "two hundred fifty-one billion, four hundred forty-one million, nine hundred sixty-eight thousand, forty-nine".