264617681 has 2 divisors, whose sum is σ = 264617682. Its totient is φ = 264617680.

The previous prime is 264617659. The next prime is 264617719. The reversal of 264617681 is 186716462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161696656 + 102921025 = 12716^2 + 10145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264617681 is a prime.

It is a super-2 number, since 2×264617681² = 140045034195635522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (264617621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132308840 + 132308841.

It is an arithmetic number, because the mean of its divisors is an integer number (132308841).

Almost surely, 2^264617681 is an apocalyptic number.

It is an amenable number.

264617681 is a deficient number, since it is larger than the sum of its proper divisors (1).

264617681 is an equidigital number, since it uses as much as digits as its factorization.

264617681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 264617681 is about 16267.0735229174. The cubic root of 264617681 is about 642.0067876794.

The spelling of 264617681 in words is "two hundred sixty-four million, six hundred seventeen thousand, six hundred eighty-one".