660855765312 has 280 divisors, whose sum is σ = 2000857161600. Its totient is φ = 215597251584.

The previous prime is 660855765307. The next prime is 660855765313. The reversal of 660855765312 is 213567558066.

It is a happy number.

660855765312 is a `hidden beast` number, since 6 + 6 + 0 + 8 + 5 + 576 + 53 + 12 = 666.

It is a super-2 number, since 2×660855765312² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660855765313) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 120613389 + ... + 120618867.

Almost surely, 2^660855765312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660855765312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1000428580800).

660855765312 is an abundant number, since it is smaller than the sum of its proper divisors (1340001396288).

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

660855765312 is a wasteful number, since it uses less digits than its factorization.

660855765312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5995 (or 5976 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 660855765312 in words is "six hundred sixty billion, eight hundred fifty-five million, seven hundred sixty-five thousand, three hundred twelve".