660913720085 has 8 divisors (see below), whose sum is σ = 793235809080. Its totient is φ = 528638079424.

The previous prime is 660913720069. The next prime is 660913720097. The reversal of 660913720085 is 580027319066.

It can be written as a sum of positive squares in 4 ways, for example, as 120502013956 + 540411706129 = 347134^2 + 735127^2 .

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 660913720085 - 2⁴ = 660913720069 is a prime.

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, 11580770 + ... + 11637699.

It is an arithmetic number, because the mean of its divisors is an integer number (99154476135).

Almost surely, 2^660913720085 is an apocalyptic number.

It is an amenable number.

660913720085 is a deficient number, since it is larger than the sum of its proper divisors (132322088995).

660913720085 is a wasteful number, since it uses less digits than its factorization.

660913720085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23224167.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 660913720085 in words is "six hundred sixty billion, nine hundred thirteen million, seven hundred twenty thousand, eighty-five".