660680434865 has 16 divisors (see below), whose sum is σ = 865119890880. Its totient is φ = 480367561920.

The previous prime is 660680434849. The next prime is 660680434901. The reversal of 660680434865 is 568434086066.

It is a happy number.

It is not a de Polignac number, because 660680434865 - 2⁴ = 660680434849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660680434865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1381514 + ... + 1797203.

It is an arithmetic number, because the mean of its divisors is an integer number (54069993180).

Almost surely, 2^660680434865 is an apocalyptic number.

It is an amenable number.

660680434865 is a deficient number, since it is larger than the sum of its proper divisors (204439456015).

660680434865 is a wasteful number, since it uses less digits than its factorization.

660680434865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182512.

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 660680434865 in words is "six hundred sixty billion, six hundred eighty million, four hundred thirty-four thousand, eight hundred sixty-five".