268991756251 has 2 divisors, whose sum is σ = 268991756252. Its totient is φ = 268991756250.

The previous prime is 268991756183. The next prime is 268991756261. The reversal of 268991756251 is 152657199862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268991756251 - 2⁷ = 268991756123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268991756251.

It is not a weakly prime, because it can be changed into another prime (268991756261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134495878125 + 134495878126.

It is an arithmetic number, because the mean of its divisors is an integer number (134495878126).

Almost surely, 2^268991756251 is an apocalyptic number.

268991756251 is a deficient number, since it is larger than the sum of its proper divisors (1).

268991756251 is an equidigital number, since it uses as much as digits as its factorization.

268991756251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 61.

The spelling of 268991756251 in words is "two hundred sixty-eight billion, nine hundred ninety-one million, seven hundred fifty-six thousand, two hundred fifty-one".