264915661 has 2 divisors, whose sum is σ = 264915662. Its totient is φ = 264915660.

The previous prime is 264915659. The next prime is 264915701. The reversal of 264915661 is 166519462.

It is a happy number.

It is an a-pointer prime, because the next prime (264915701) can be obtained adding 264915661 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225150025 + 39765636 = 15005^2 + 6306^2 .

It is a cyclic number.

It is not a de Polignac number, because 264915661 - 2¹ = 264915659 is a prime.

Together with 264915659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264915601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132457830 + 132457831.

It is an arithmetic number, because the mean of its divisors is an integer number (132457831).

Almost surely, 2^264915661 is an apocalyptic number.

It is an amenable number.

264915661 is a deficient number, since it is larger than the sum of its proper divisors (1).

264915661 is an equidigital number, since it uses as much as digits as its factorization.

264915661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 264915661 is about 16276.2299381644. The cubic root of 264915661 is about 642.2476804000.

The spelling of 264915661 in words is "two hundred sixty-four million, nine hundred fifteen thousand, six hundred sixty-one".