646674169 has 8 divisors (see below), whose sum is σ = 685082880. Its totient is φ = 608306496.

The previous prime is 646674163. The next prime is 646674179. The reversal of 646674169 is 961476646.

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

It is a cyclic number.

It is not a de Polignac number, because 646674169 - 2⁵ = 646674137 is a prime.

It is a super-2 number, since 2×646674169² = 836374961703681122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646674163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25852 + ... + 44290.

It is an arithmetic number, because the mean of its divisors is an integer number (85635360).

Almost surely, 2^646674169 is an apocalyptic number.

It is an amenable number.

646674169 is a deficient number, since it is larger than the sum of its proper divisors (38408711).

646674169 is a wasteful number, since it uses less digits than its factorization.

646674169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20519.

The product of its digits is 1306368, while the sum is 49.

The square root of 646674169 is about 25429.7890081691. The cubic root of 646674169 is about 864.7591604550.

The spelling of 646674169 in words is "six hundred forty-six million, six hundred seventy-four thousand, one hundred sixty-nine".