251362155643 has 2 divisors, whose sum is σ = 251362155644. Its totient is φ = 251362155642.

The previous prime is 251362155619. The next prime is 251362155683. The reversal of 251362155643 is 346551263152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251362155643 - 2²⁵ = 251328601211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251362155643.

It is not a weakly prime, because it can be changed into another prime (251362155683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125681077821 + 125681077822.

It is an arithmetic number, because the mean of its divisors is an integer number (125681077822).

Almost surely, 2^251362155643 is an apocalyptic number.

251362155643 is a deficient number, since it is larger than the sum of its proper divisors (1).

251362155643 is an equidigital number, since it uses as much as digits as its factorization.

251362155643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The spelling of 251362155643 in words is "two hundred fifty-one billion, three hundred sixty-two million, one hundred fifty-five thousand, six hundred forty-three".