665814516 has 12 divisors (see below), whose sum is σ = 1553567232. Its totient is φ = 221938168.

The previous prime is 665814491. The next prime is 665814517. The reversal of 665814516 is 615418566.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665814517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27742260 + ... + 27742283.

It is an arithmetic number, because the mean of its divisors is an integer number (129463936).

Almost surely, 2^665814516 is an apocalyptic number.

It is an amenable number.

665814516 is an abundant number, since it is smaller than the sum of its proper divisors (887752716).

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

665814516 is a wasteful number, since it uses less digits than its factorization.

665814516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55484550 (or 55484548 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 665814516 is about 25803.3818713749. The cubic root of 665814516 is about 873.2080949459.

The spelling of 665814516 in words is "six hundred sixty-five million, eight hundred fourteen thousand, five hundred sixteen".