660776775120 has 960 divisors, whose sum is σ = 2864310958080. Its totient is φ = 132519628800.

The previous prime is 660776775107. The next prime is 660776775179. The reversal of 660776775120 is 21577677066.

660776775120 is a `hidden beast` number, since 6 + 60 + 7 + 7 + 67 + 7 + 512 + 0 = 666.

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 268716451 + ... + 268718909.

It is an arithmetic number, because the mean of its divisors is an integer number (2983657248).

Almost surely, 2^660776775120 is an apocalyptic number.

660776775120 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 660776775120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432155479040).

660776775120 is an abundant number, since it is smaller than the sum of its proper divisors (2203534182960).

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

660776775120 is a wasteful number, since it uses less digits than its factorization.

660776775120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664 (or 2655 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 54.

The spelling of 660776775120 in words is "six hundred sixty billion, seven hundred seventy-six million, seven hundred seventy-five thousand, one hundred twenty".