660506615165 has 4 divisors (see below), whose sum is σ = 792607938204. Its totient is φ = 528405292128.

The previous prime is 660506615141. The next prime is 660506615173. The reversal of 660506615165 is 561516605066.

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 409085601604 + 251421013561 = 639598^2 + 501419^2 .

It is a cyclic number.

It is not a de Polignac number, because 660506615165 - 2¹⁶ = 660506549629 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 66050661512 + ... + 66050661521.

It is an arithmetic number, because the mean of its divisors is an integer number (198151984551).

Almost surely, 2^660506615165 is an apocalyptic number.

It is an amenable number.

660506615165 is a deficient number, since it is larger than the sum of its proper divisors (132101323039).

660506615165 is a wasteful number, since it uses less digits than its factorization.

660506615165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132101323038.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 660506615165 in words is "six hundred sixty billion, five hundred six million, six hundred fifteen thousand, one hundred sixty-five".