664811707 has 16 divisors (see below), whose sum is σ = 805920192. Its totient is φ = 535357440.

The previous prime is 664811699. The next prime is 664811717. The reversal of 664811707 is 707118466.

664811707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664811707 - 2³ = 664811699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664811707.

It is not an unprimeable number, because it can be changed into a prime (664811717) 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, 65857 + ... + 75277.

It is an arithmetic number, because the mean of its divisors is an integer number (50370012).

Almost surely, 2^664811707 is an apocalyptic number.

664811707 is a deficient number, since it is larger than the sum of its proper divisors (141108485).

664811707 is a wasteful number, since it uses less digits than its factorization.

664811707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 664811707 is about 25783.9428133092. The cubic root of 664811707 is about 872.7694838383.

The spelling of 664811707 in words is "six hundred sixty-four million, eight hundred eleven thousand, seven hundred seven".