669974818 has 8 divisors (see below), whose sum is σ = 1007494812. Its totient is φ = 334143216.

The previous prime is 669974803. The next prime is 669974861. The reversal of 669974818 is 818479966.

It can be written as a sum of positive squares in 2 ways, for example, as 667550569 + 2424249 = 25837^2 + 1557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421105 + ... + 422692.

Almost surely, 2^669974818 is an apocalyptic number.

669974818 is a deficient number, since it is larger than the sum of its proper divisors (337519994).

669974818 is a wasteful number, since it uses less digits than its factorization.

669974818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844196.

The product of its digits is 5225472, while the sum is 58.

The square root of 669974818 is about 25883.8717737513. The cubic root of 669974818 is about 875.0230494064.

The spelling of 669974818 in words is "six hundred sixty-nine million, nine hundred seventy-four thousand, eight hundred eighteen".