264747661 has 4 divisors (see below), whose sum is σ = 264780412. Its totient is φ = 264714912.

The previous prime is 264747643. The next prime is 264747671. The reversal of 264747661 is 166747462.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 104244100 + 160503561 = 10210^2 + 12669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264747661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264747671) 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, 5425 + ... + 23641.

It is an arithmetic number, because the mean of its divisors is an integer number (66195103).

Almost surely, 2^264747661 is an apocalyptic number.

It is an amenable number.

264747661 is a deficient number, since it is larger than the sum of its proper divisors (32751).

264747661 is a wasteful number, since it uses less digits than its factorization.

264747661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32750.

The product of its digits is 338688, while the sum is 43.

The square root of 264747661 is about 16271.0682193887. The cubic root of 264747661 is about 642.1118882185. Note that the first 3 decimals are identical.

The spelling of 264747661 in words is "two hundred sixty-four million, seven hundred forty-seven thousand, six hundred sixty-one".