664135923 has 16 divisors (see below), whose sum is σ = 1022841216. Its totient is φ = 378829440.

The previous prime is 664135907. The next prime is 664135939. The reversal of 664135923 is 329531466.

It is an interprime number because it is at equal distance from previous prime (664135907) and next prime (664135939).

It is not a de Polignac number, because 664135923 - 2⁴ = 664135907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664135223) 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, 591361 + ... + 592482.

It is an arithmetic number, because the mean of its divisors is an integer number (63927576).

Almost surely, 2^664135923 is an apocalyptic number.

664135923 is a deficient number, since it is larger than the sum of its proper divisors (358705293).

664135923 is a wasteful number, since it uses less digits than its factorization.

664135923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183874.

The product of its digits is 116640, while the sum is 39.

The square root of 664135923 is about 25770.8347361897. The cubic root of 664135923 is about 872.4736589175.

The spelling of 664135923 in words is "six hundred sixty-four million, one hundred thirty-five thousand, nine hundred twenty-three".