664240659 has 16 divisors (see below), whose sum is σ = 899844000. Its totient is φ = 435787776.

The previous prime is 664240657. The next prime is 664240697. The reversal of 664240659 is 956042466.

It is not a de Polignac number, because 664240659 - 2¹ = 664240657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664240659.

It is not an unprimeable number, because it can be changed into a prime (664240657) 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, 41907 + ... + 55539.

It is an arithmetic number, because the mean of its divisors is an integer number (56240250).

Almost surely, 2^664240659 is an apocalyptic number.

664240659 is a deficient number, since it is larger than the sum of its proper divisors (235603341).

664240659 is a wasteful number, since it uses less digits than its factorization.

664240659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13894.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 664240659 is about 25772.8667206425. The cubic root of 664240659 is about 872.5195203116.

The spelling of 664240659 in words is "six hundred sixty-four million, two hundred forty thousand, six hundred fifty-nine".