251164799987 has 2 divisors, whose sum is σ = 251164799988. Its totient is φ = 251164799986.

The previous prime is 251164799891. The next prime is 251164800001. The reversal of 251164799987 is 789997461152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251164799987 - 2³⁶ = 182445323251 is a prime.

It is not a weakly prime, because it can be changed into another prime (251164799287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125582399993 + 125582399994.

It is an arithmetic number, because the mean of its divisors is an integer number (125582399994).

Almost surely, 2^251164799987 is an apocalyptic number.

251164799987 is a deficient number, since it is larger than the sum of its proper divisors (1).

251164799987 is an equidigital number, since it uses as much as digits as its factorization.

251164799987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 68.

The spelling of 251164799987 in words is "two hundred fifty-one billion, one hundred sixty-four million, seven hundred ninety-nine thousand, nine hundred eighty-seven".