660115665651 has 64 divisors (see below), whose sum is σ = 962673868800. Its totient is φ = 399938964480.

The previous prime is 660115665647. The next prime is 660115665679. The reversal of 660115665651 is 156566511066.

It is not a de Polignac number, because 660115665651 - 2² = 660115665647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660115665651.

It is not an unprimeable number, because it can be changed into a prime (660115665631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 407226621 + ... + 407228241.

It is an arithmetic number, because the mean of its divisors is an integer number (15041779200).

Almost surely, 2^660115665651 is an apocalyptic number.

660115665651 is a deficient number, since it is larger than the sum of its proper divisors (302558203149).

660115665651 is a wasteful number, since it uses less digits than its factorization.

660115665651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 660115665651 in words is "six hundred sixty billion, one hundred fifteen million, six hundred sixty-five thousand, six hundred fifty-one".