264312661 has 4 divisors (see below), whose sum is σ = 265246912. Its totient is φ = 263378412.

The previous prime is 264312647. The next prime is 264312689. The reversal of 264312661 is 166213462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166213462 = 2 ⋅83106731.

It is a cyclic number.

It is not a de Polignac number, because 264312661 - 2¹⁹ = 263788373 is a prime.

It is a super-2 number, since 2×264312661² = 139722365529801842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264312611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466701 + ... + 467266.

It is an arithmetic number, because the mean of its divisors is an integer number (66311728).

Almost surely, 2^264312661 is an apocalyptic number.

It is an amenable number.

264312661 is a deficient number, since it is larger than the sum of its proper divisors (934251).

264312661 is an equidigital number, since it uses as much as digits as its factorization.

264312661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934250.

The product of its digits is 10368, while the sum is 31.

The square root of 264312661 is about 16257.6954393912. The cubic root of 264312661 is about 641.7600163133.

It can be divided in two parts, 26431 and 2661, that added together give a palindrome (29092).

The spelling of 264312661 in words is "two hundred sixty-four million, three hundred twelve thousand, six hundred sixty-one".