265721057267 has 2 divisors, whose sum is σ = 265721057268. Its totient is φ = 265721057266.

The previous prime is 265721057249. The next prime is 265721057321. The reversal of 265721057267 is 762750127562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265721057267 - 2¹⁰ = 265721056243 is a prime.

It is not a weakly prime, because it can be changed into another prime (265721017267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132860528633 + 132860528634.

It is an arithmetic number, because the mean of its divisors is an integer number (132860528634).

Almost surely, 2^265721057267 is an apocalyptic number.

265721057267 is a deficient number, since it is larger than the sum of its proper divisors (1).

265721057267 is an equidigital number, since it uses as much as digits as its factorization.

265721057267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 50.

The spelling of 265721057267 in words is "two hundred sixty-five billion, seven hundred twenty-one million, fifty-seven thousand, two hundred sixty-seven".