264123661 has 4 divisors (see below), whose sum is σ = 264843712. Its totient is φ = 263403612.

The previous prime is 264123647. The next prime is 264123667. The reversal of 264123661 is 166321462.

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: 166321462 = 2 ⋅83160731.

It is a cyclic number.

It is not a de Polignac number, because 264123661 - 2¹³ = 264115469 is a prime.

It is a super-2 number, since 2×264123661² = 139522616600085842, 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 (264123667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359475 + ... + 360208.

It is an arithmetic number, because the mean of its divisors is an integer number (66210928).

Almost surely, 2^264123661 is an apocalyptic number.

It is an amenable number.

264123661 is a deficient number, since it is larger than the sum of its proper divisors (720051).

264123661 is an equidigital number, since it uses as much as digits as its factorization.

264123661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720050.

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

The square root of 264123661 is about 16251.8817679677. The cubic root of 264123661 is about 641.6070137233.

The spelling of 264123661 in words is "two hundred sixty-four million, one hundred twenty-three thousand, six hundred sixty-one".