665601516 has 48 divisors (see below), whose sum is σ = 1728545280. Its totient is φ = 221492880.

The previous prime is 665601511. The next prime is 665601523. The reversal of 665601516 is 615106566.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (665601511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63265 + ... + 73031.

It is an arithmetic number, because the mean of its divisors is an integer number (36011360).

Almost surely, 2^665601516 is an apocalyptic number.

It is an amenable number.

665601516 is an abundant number, since it is smaller than the sum of its proper divisors (1062943764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665601516 is a wasteful number, since it uses less digits than its factorization.

665601516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10411 (or 10403 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 665601516 is about 25799.2541752664. The cubic root of 665601516 is about 873.1149693296.

The spelling of 665601516 in words is "six hundred sixty-five million, six hundred one thousand, five hundred sixteen".