660117999 has 32 divisors (see below), whose sum is σ = 956067840. Its totient is φ = 404179200.

The previous prime is 660117979. The next prime is 660118013. The reversal of 660117999 is 999711066.

It is not a de Polignac number, because 660117999 - 2⁹ = 660117487 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660117949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138742 + ... + 143420.

It is an arithmetic number, because the mean of its divisors is an integer number (29877120).

Almost surely, 2^660117999 is an apocalyptic number.

660117999 is a deficient number, since it is larger than the sum of its proper divisors (295949841).

660117999 is a wasteful number, since it uses less digits than its factorization.

660117999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791.

The product of its (nonzero) digits is 183708, while the sum is 48.

The square root of 660117999 is about 25692.7616071142. The cubic root of 660117999 is about 870.7106533305.

The spelling of 660117999 in words is "six hundred sixty million, one hundred seventeen thousand, nine hundred ninety-nine".