673664465 has 4 divisors (see below), whose sum is σ = 808397364. Its totient is φ = 538931568.

The previous prime is 673664447. The next prime is 673664477. The reversal of 673664465 is 564466376.

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

It can be written as a sum of positive squares in 2 ways, for example, as 146870161 + 526794304 = 12119^2 + 22952^2 .

It is a cyclic number.

It is not a de Polignac number, because 673664465 - 2²² = 669470161 is a prime.

It is a super-2 number, since 2×673664465² = 907647622807472450, which contains 22 as substring.

It is a Duffinian number.

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, 67366442 + ... + 67366451.

It is an arithmetic number, because the mean of its divisors is an integer number (202099341).

Almost surely, 2^673664465 is an apocalyptic number.

It is an amenable number.

673664465 is a deficient number, since it is larger than the sum of its proper divisors (134732899).

673664465 is a wasteful number, since it uses less digits than its factorization.

673664465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134732898.

The product of its digits is 2177280, while the sum is 47.

The square root of 673664465 is about 25955.0470043882. The cubic root of 673664465 is about 876.6264019989.

The spelling of 673664465 in words is "six hundred seventy-three million, six hundred sixty-four thousand, four hundred sixty-five".