660618005 has 8 divisors (see below), whose sum is σ = 792987192. Its totient is φ = 528330688.

The previous prime is 660617981. The next prime is 660618037. The reversal of 660618005 is 500816066.

It can be written as a sum of positive squares in 4 ways, for example, as 90459121 + 570158884 = 9511^2 + 23878^2 .

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 660618005 - 2²² = 656423701 is a prime.

It is a super-2 number, since 2×660618005² = 872832297060360050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034 + ... + 36363.

It is an arithmetic number, because the mean of its divisors is an integer number (99123399).

Almost surely, 2^660618005 is an apocalyptic number.

It is an amenable number.

660618005 is a deficient number, since it is larger than the sum of its proper divisors (132369187).

660618005 is a wasteful number, since it uses less digits than its factorization.

660618005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40935.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 660618005 is about 25702.4902490012. The cubic root of 660618005 is about 870.9304376098.

The spelling of 660618005 in words is "six hundred sixty million, six hundred eighteen thousand, five".