666580741632 has 960 divisors, whose sum is σ = 2293811520000. Its totient is φ = 191556845568.

The previous prime is 666580741627. The next prime is 666580741633. The reversal of 666580741632 is 236147085666.

It is a super-2 number, since 2×666580741632² (a number of 24 digits) contains 22 as substring.

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 (666580741633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3349651869 + ... + 3349652067.

It is an arithmetic number, because the mean of its divisors is an integer number (2389387000).

Almost surely, 2^666580741632 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 666580741632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146905760000).

666580741632 is an abundant number, since it is smaller than the sum of its proper divisors (1627230778368).

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

666580741632 is a wasteful number, since it uses less digits than its factorization.

666580741632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 666580741632 in words is "six hundred sixty-six billion, five hundred eighty million, seven hundred forty-one thousand, six hundred thirty-two".