264321455261 has 2 divisors, whose sum is σ = 264321455262. Its totient is φ = 264321455260.

The previous prime is 264321455243. The next prime is 264321455441. The reversal of 264321455261 is 162554123462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205566119236 + 58755336025 = 453394^2 + 242395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264321455261 is a prime.

It is a super-2 number, since 2×264321455261² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264321454261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132160727630 + 132160727631.

It is an arithmetic number, because the mean of its divisors is an integer number (132160727631).

Almost surely, 2^264321455261 is an apocalyptic number.

It is an amenable number.

264321455261 is a deficient number, since it is larger than the sum of its proper divisors (1).

264321455261 is an equidigital number, since it uses as much as digits as its factorization.

264321455261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 41.

The spelling of 264321455261 in words is "two hundred sixty-four billion, three hundred twenty-one million, four hundred fifty-five thousand, two hundred sixty-one".