665706115 has 16 divisors (see below), whose sum is σ = 814117536. Its totient is φ = 522432000.

The previous prime is 665706113. The next prime is 665706127. The reversal of 665706115 is 511607566.

It is not a de Polignac number, because 665706115 - 2¹ = 665706113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665706113) 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, 119584 + ... + 125026.

It is an arithmetic number, because the mean of its divisors is an integer number (50882346).

Almost surely, 2^665706115 is an apocalyptic number.

665706115 is a deficient number, since it is larger than the sum of its proper divisors (148411421).

665706115 is a wasteful number, since it uses less digits than its factorization.

665706115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5910.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 665706115 is about 25801.2812666348. The cubic root of 665706115 is about 873.1607034848.

The spelling of 665706115 in words is "six hundred sixty-five million, seven hundred six thousand, one hundred fifteen".