660377745720 has 288 divisors, whose sum is σ = 2696088900960. Its totient is φ = 137221286400.

The previous prime is 660377745701. The next prime is 660377745739. The reversal of 660377745720 is 27547773066.

660377745720 is a `hidden beast` number, since 6 + 60 + 3 + 7 + 7 + 7 + 4 + 572 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (660377745701) and next prime (660377745739).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 777951 + ... + 1387790.

It is an arithmetic number, because the mean of its divisors is an integer number (9361419795).

Almost surely, 2^660377745720 is an apocalyptic number.

660377745720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660377745720 is an abundant number, since it is smaller than the sum of its proper divisors (2035711155240).

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

660377745720 is a wasteful number, since it uses less digits than its factorization.

660377745720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165787 (or 2165769 counting only the distinct ones).

The product of its (nonzero) digits is 10372320, while the sum is 54.

The spelling of 660377745720 in words is "six hundred sixty billion, three hundred seventy-seven million, seven hundred forty-five thousand, seven hundred twenty".