264497661 has 12 divisors (see below), whose sum is σ = 395226780. Its totient is φ = 170251200.

The previous prime is 264497659. The next prime is 264497663. The reversal of 264497661 is 166794462.

It is an interprime number because it is at equal distance from previous prime (264497659) and next prime (264497663).

It can be written as a sum of positive squares in 2 ways, for example, as 116510436 + 147987225 = 10794^2 + 12165^2 .

It is not a de Polignac number, because 264497661 - 2¹ = 264497659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264497663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 506440 + ... + 506961.

It is an arithmetic number, because the mean of its divisors is an integer number (32935565).

Almost surely, 2^264497661 is an apocalyptic number.

It is an amenable number.

264497661 is a deficient number, since it is larger than the sum of its proper divisors (130729119).

264497661 is a wasteful number, since it uses less digits than its factorization.

264497661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013436 (or 1013433 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 264497661 is about 16263.3840574463. The cubic root of 264497661 is about 641.9097101311.

The spelling of 264497661 in words is "two hundred sixty-four million, four hundred ninety-seven thousand, six hundred sixty-one".