251240663423 has 2 divisors, whose sum is σ = 251240663424. Its totient is φ = 251240663422.

The previous prime is 251240663417. The next prime is 251240663533. The reversal of 251240663423 is 324366042152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251240663423 - 2²⁶ = 251173554559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251240663413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125620331711 + 125620331712.

It is an arithmetic number, because the mean of its divisors is an integer number (125620331712).

Almost surely, 2^251240663423 is an apocalyptic number.

251240663423 is a deficient number, since it is larger than the sum of its proper divisors (1).

251240663423 is an equidigital number, since it uses as much as digits as its factorization.

251240663423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 251240663423 in words is "two hundred fifty-one billion, two hundred forty million, six hundred sixty-three thousand, four hundred twenty-three".