669614578 has 4 divisors (see below), whose sum is σ = 1004421870. Its totient is φ = 334807288.

The previous prime is 669614509. The next prime is 669614597. The reversal of 669614578 is 875416966.

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., 590635809 + 78978769 = 24303^2 + 8887^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167403643 + ... + 167403646.

Almost surely, 2^669614578 is an apocalyptic number.

669614578 is a deficient number, since it is larger than the sum of its proper divisors (334807292).

669614578 is a wasteful number, since it uses less digits than its factorization.

669614578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334807291.

The product of its digits is 2177280, while the sum is 52.

The square root of 669614578 is about 25876.9120646185. The cubic root of 669614578 is about 874.8661903681.

The spelling of 669614578 in words is "six hundred sixty-nine million, six hundred fourteen thousand, five hundred seventy-eight".