916659665 has 4 divisors (see below), whose sum is σ = 1099991604. Its totient is φ = 733327728.

The previous prime is 916659661. The next prime is 916659671. The reversal of 916659665 is 566956619.

916659665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 163047361 + 753612304 = 12769^2 + 27452^2 .

It is a cyclic number.

It is not a de Polignac number, because 916659665 - 2² = 916659661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916659661) 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, 91665962 + ... + 91665971.

It is an arithmetic number, because the mean of its divisors is an integer number (274997901).

Almost surely, 2^916659665 is an apocalyptic number.

It is an amenable number.

916659665 is a deficient number, since it is larger than the sum of its proper divisors (183331939).

916659665 is a wasteful number, since it uses less digits than its factorization.

916659665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183331938.

The product of its digits is 2624400, while the sum is 53.

The square root of 916659665 is about 30276.3879120347. The cubic root of 916659665 is about 971.4103072598.

The spelling of 916659665 in words is "nine hundred sixteen million, six hundred fifty-nine thousand, six hundred sixty-five".