264540661 has 24 divisors (see below), whose sum is σ = 337578624. Its totient is φ = 204986880.

The previous prime is 264540659. The next prime is 264540677. The reversal of 264540661 is 166045462.

It is not a de Polignac number, because 264540661 - 2¹ = 264540659 is a prime.

It is a super-2 number, since 2×264540661² = 139963522644633842, 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 (264540611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102756 + ... + 105298.

It is an arithmetic number, because the mean of its divisors is an integer number (14065776).

Almost surely, 2^264540661 is an apocalyptic number.

It is an amenable number.

264540661 is a deficient number, since it is larger than the sum of its proper divisors (73037963).

264540661 is a wasteful number, since it uses less digits than its factorization.

264540661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 264540661 is about 16264.7059918094. The cubic root of 264540661 is about 641.9444938312.

The spelling of 264540661 in words is "two hundred sixty-four million, five hundred forty thousand, six hundred sixty-one".