664232547 has 16 divisors (see below), whose sum is σ = 992270592. Its totient is φ = 391684320.

The previous prime is 664232539. The next prime is 664232549. The reversal of 664232547 is 745232466.

It is not a de Polignac number, because 664232547 - 2³ = 664232539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664232549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270783 + ... + 273224.

It is an arithmetic number, because the mean of its divisors is an integer number (62016912).

Almost surely, 2^664232547 is an apocalyptic number.

664232547 is a deficient number, since it is larger than the sum of its proper divisors (328038045).

664232547 is a wasteful number, since it uses less digits than its factorization.

664232547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544058.

The product of its digits is 241920, while the sum is 39.

The square root of 664232547 is about 25772.7093453521. The cubic root of 664232547 is about 872.5159684327.

The spelling of 664232547 in words is "six hundred sixty-four million, two hundred thirty-two thousand, five hundred forty-seven".