660557317 has 8 divisors (see below), whose sum is σ = 770985216. Its totient is φ = 554145072.

The previous prime is 660557291. The next prime is 660557341. The reversal of 660557317 is 713755066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660557317 - 2¹⁹ = 660033029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660557317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660557347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1003558 + ... + 1004215.

It is an arithmetic number, because the mean of its divisors is an integer number (96373152).

Almost surely, 2^660557317 is an apocalyptic number.

It is an amenable number.

660557317 is a deficient number, since it is larger than the sum of its proper divisors (110427899).

660557317 is a wasteful number, since it uses less digits than its factorization.

660557317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007827.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 660557317 is about 25701.3096358921. The cubic root of 660557317 is about 870.9037673079.

The spelling of 660557317 in words is "six hundred sixty million, five hundred fifty-seven thousand, three hundred seventeen".