673997665 has 16 divisors (see below), whose sum is σ = 887749056. Its totient is φ = 487166400.

The previous prime is 673997633. The next prime is 673997683. The reversal of 673997665 is 566799376.

It is not a de Polignac number, because 673997665 - 2⁵ = 673997633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28626 + ... + 46555.

It is an arithmetic number, because the mean of its divisors is an integer number (55484316).

Almost surely, 2^673997665 is an apocalyptic number.

It is an amenable number.

673997665 is a deficient number, since it is larger than the sum of its proper divisors (213751391).

673997665 is a wasteful number, since it uses less digits than its factorization.

673997665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75360.

The product of its digits is 12859560, while the sum is 58.

The square root of 673997665 is about 25961.4650010357. The cubic root of 673997665 is about 876.7709070597.

The spelling of 673997665 in words is "six hundred seventy-three million, nine hundred ninety-seven thousand, six hundred sixty-five".