264011643 has 40 divisors (see below), whose sum is σ = 460365312. Its totient is φ = 147639024.

The previous prime is 264011639. The next prime is 264011651. The reversal of 264011643 is 346110462.

264011643 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 11 + 643 = 666.

It is not a de Polignac number, because 264011643 - 2² = 264011639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (264011623) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21696 + ... + 31602.

Almost surely, 2^264011643 is an apocalyptic number.

264011643 is a deficient number, since it is larger than the sum of its proper divisors (196353669).

264011643 is an equidigital number, since it uses as much as digits as its factorization.

264011643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9973 (or 9964 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 264011643 is about 16248.4350938790. The cubic root of 264011643 is about 641.5162964975.

The spelling of 264011643 in words is "two hundred sixty-four million, eleven thousand, six hundred forty-three".