251064640743911 has 2 divisors, whose sum is σ = 251064640743912. Its totient is φ = 251064640743910.

The previous prime is 251064640743827. The next prime is 251064640743919. The reversal of 251064640743911 is 119347046460152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251064640743911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251064640743919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125532320371955 + 125532320371956.

It is an arithmetic number, because the mean of its divisors is an integer number (125532320371956).

Almost surely, 2^{251064640743911} is an apocalyptic number.

251064640743911 is a deficient number, since it is larger than the sum of its proper divisors (1).

251064640743911 is an equidigital number, since it uses as much as digits as its factorization.

251064640743911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 251064640743911 in words is "two hundred fifty-one trillion, sixty-four billion, six hundred forty million, seven hundred forty-three thousand, nine hundred eleven".