660861042660 has 576 divisors, whose sum is σ = 2749858675200. Its totient is φ = 124324429824.

The previous prime is 660861042659. The next prime is 660861042661. The reversal of 660861042660 is 66240168066.

660861042660 is a `hidden beast` number, since 6 + 6 + 0 + 8 + 610 + 4 + 26 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (660861042659) and next prime (660861042661).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (660861042661) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5228286 + ... + 5353194.

It is an arithmetic number, because the mean of its divisors is an integer number (4774060200).

Almost surely, 2^660861042660 is an apocalyptic number.

660861042660 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 660861042660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374929337600).

660861042660 is an abundant number, since it is smaller than the sum of its proper divisors (2088997632540).

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

660861042660 is a wasteful number, since it uses less digits than its factorization.

660861042660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124980 (or 124975 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 660861042660 in words is "six hundred sixty billion, eight hundred sixty-one million, forty-two thousand, six hundred sixty".