665375408 has 10 divisors (see below), whose sum is σ = 1289164884. Its totient is φ = 332687696.

The previous prime is 665375401. The next prime is 665375419. The reversal of 665375408 is 804573566.

It is not an unprimeable number, because it can be changed into a prime (665375401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20792966 + ... + 20792997.

Almost surely, 2^665375408 is an apocalyptic number.

It is an amenable number.

665375408 is a deficient number, since it is larger than the sum of its proper divisors (623789476).

665375408 is a wasteful number, since it uses less digits than its factorization.

665375408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41585971 (or 41585965 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The square root of 665375408 is about 25794.8717383902. The cubic root of 665375408 is about 873.0160910300.

The spelling of 665375408 in words is "six hundred sixty-five million, three hundred seventy-five thousand, four hundred eight".