665535516 has 24 divisors (see below), whose sum is σ = 1644264720. Its totient is φ = 208795392.

The previous prime is 665535509. The next prime is 665535523. The reversal of 665535516 is 615535566.

It is an interprime number because it is at equal distance from previous prime (665535509) and next prime (665535523).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631011 + ... + 1631418.

It is an arithmetic number, because the mean of its divisors is an integer number (68511030).

Almost surely, 2^665535516 is an apocalyptic number.

It is an amenable number.

665535516 is an abundant number, since it is smaller than the sum of its proper divisors (978729204).

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

665535516 is a wasteful number, since it uses less digits than its factorization.

665535516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262453 (or 3262451 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The square root of 665535516 is about 25797.9750368125. The cubic root of 665535516 is about 873.0861094731.

The spelling of 665535516 in words is "six hundred sixty-five million, five hundred thirty-five thousand, five hundred sixteen".