664115674 has 4 divisors (see below), whose sum is σ = 996173514. Its totient is φ = 332057836.

The previous prime is 664115657. The next prime is 664115717. The reversal of 664115674 is 476511466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 355586449 + 308529225 = 18857^2 + 17565^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 166028917 + ... + 166028920.

Almost surely, 2^664115674 is an apocalyptic number.

664115674 is a deficient number, since it is larger than the sum of its proper divisors (332057840).

664115674 is a wasteful number, since it uses less digits than its factorization.

664115674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332057839.

The product of its digits is 120960, while the sum is 40.

The square root of 664115674 is about 25770.4418666037. The cubic root of 664115674 is about 872.4647918076.

The spelling of 664115674 in words is "six hundred sixty-four million, one hundred fifteen thousand, six hundred seventy-four".