660499117 has 4 divisors (see below), whose sum is σ = 661570236. Its totient is φ = 659428000.

The previous prime is 660499097. The next prime is 660499127. The reversal of 660499117 is 711994066.

It is a happy number.

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 17065161 + 643433956 = 4131^2 + 25366^2 .

It is a cyclic number.

It is not a de Polignac number, because 660499117 - 2²³ = 652110509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660499127) 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, 534634 + ... + 535867.

It is an arithmetic number, because the mean of its divisors is an integer number (165392559).

Almost surely, 2^660499117 is an apocalyptic number.

It is an amenable number.

660499117 is a deficient number, since it is larger than the sum of its proper divisors (1071119).

660499117 is a wasteful number, since it uses less digits than its factorization.

660499117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071118.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 660499117 is about 25700.1773729288. The cubic root of 660499117 is about 870.8781888624.

The spelling of 660499117 in words is "six hundred sixty million, four hundred ninety-nine thousand, one hundred seventeen".