264609661 has 4 divisors (see below), whose sum is σ = 264721824. Its totient is φ = 264497500.

The previous prime is 264609649. The next prime is 264609677. The reversal of 264609661 is 166906462.

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.

It is a cyclic number.

It is not a de Polignac number, because 264609661 - 2¹¹ = 264607613 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 (264609461) 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, 52465 + ... + 57286.

It is an arithmetic number, because the mean of its divisors is an integer number (66180456).

Almost surely, 2^264609661 is an apocalyptic number.

It is an amenable number.

264609661 is a deficient number, since it is larger than the sum of its proper divisors (112163).

264609661 is a wasteful number, since it uses less digits than its factorization.

264609661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112162.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 264609661 is about 16266.8270108217. The cubic root of 264609661 is about 642.0003016597. Note that the first 3 decimals are identical.

The spelling of 264609661 in words is "two hundred sixty-four million, six hundred nine thousand, six hundred sixty-one".