660386513 has 8 divisors (see below), whose sum is σ = 667234656. Its totient is φ = 653572800.

The previous prime is 660386501. The next prime is 660386527. The reversal of 660386513 is 315683066.

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 660386513 - 2¹⁸ = 660124369 is a prime.

It is a super-2 number, since 2×660386513² = 872220693104598338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660386563) 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, 30878 + ... + 47688.

It is an arithmetic number, because the mean of its divisors is an integer number (83404332).

Almost surely, 2^660386513 is an apocalyptic number.

It is an amenable number.

660386513 is a deficient number, since it is larger than the sum of its proper divisors (6848143).

660386513 is a wasteful number, since it uses less digits than its factorization.

660386513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17215.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 660386513 is about 25697.9865553704. The cubic root of 660386513 is about 870.8286960176.

The spelling of 660386513 in words is "six hundred sixty million, three hundred eighty-six thousand, five hundred thirteen".