664742475 has 18 divisors (see below), whose sum is σ = 1190628036. Its totient is φ = 354529200.

The previous prime is 664742473. The next prime is 664742489. The reversal of 664742475 is 574247466.

It is not a de Polignac number, because 664742475 - 2¹ = 664742473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 664742475.

It is not an unprimeable number, because it can be changed into a prime (664742473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1476981 + ... + 1477430.

It is an arithmetic number, because the mean of its divisors is an integer number (66146002).

Almost surely, 2^664742475 is an apocalyptic number.

664742475 is a deficient number, since it is larger than the sum of its proper divisors (525885561).

664742475 is a wasteful number, since it uses less digits than its factorization.

664742475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954427 (or 2954419 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 45.

The square root of 664742475 is about 25782.6002373694. The cubic root of 664742475 is about 872.7391867011.

The spelling of 664742475 in words is "six hundred sixty-four million, seven hundred forty-two thousand, four hundred seventy-five".