264918991369 has 2 divisors, whose sum is σ = 264918991370. Its totient is φ = 264918991368.

The previous prime is 264918991339. The next prime is 264918991397. The reversal of 264918991369 is 963199819462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241560454144 + 23358537225 = 491488^2 + 152835^2 .

It is a cyclic number.

It is not a de Polignac number, because 264918991369 - 2⁹ = 264918990857 is a prime.

It is a super-2 number, since 2×264918991369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (264918991339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132459495684 + 132459495685.

It is an arithmetic number, because the mean of its divisors is an integer number (132459495685).

Almost surely, 2^264918991369 is an apocalyptic number.

It is an amenable number.

264918991369 is a deficient number, since it is larger than the sum of its proper divisors (1).

264918991369 is an equidigital number, since it uses as much as digits as its factorization.

264918991369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45349632, while the sum is 67.

The spelling of 264918991369 in words is "two hundred sixty-four billion, nine hundred eighteen million, nine hundred ninety-one thousand, three hundred sixty-nine".