665664185160 has 320 divisors, whose sum is σ = 2410831684800. Its totient is φ = 163763679744.

The previous prime is 665664185149. The next prime is 665664185177. The reversal of 665664185160 is 61581466566.

665664185160 is a `hidden beast` number, since 6 + 6 + 5 + 66 + 418 + 5 + 160 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 665664185097 and 665664185106.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 103569867 + ... + 103576293.

It is an arithmetic number, because the mean of its divisors is an integer number (7533849015).

Almost surely, 2^665664185160 is an apocalyptic number.

665664185160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665664185160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1205415842400).

665664185160 is an abundant number, since it is smaller than the sum of its proper divisors (1745167499640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665664185160 is a wasteful number, since it uses less digits than its factorization.

665664185160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8922 (or 8909 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 665664185160 in words is "six hundred sixty-five billion, six hundred sixty-four million, one hundred eighty-five thousand, one hundred sixty".