6640402573660 has 24 divisors (see below), whose sum is σ = 13949824046256. Its totient is φ = 2655212716800.

The previous prime is 6640402573657. The next prime is 6640402573667. The reversal of 6640402573660 is 663752040466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640402573667) 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 7 ways as a sum of consecutive naturals, for example, 59212122 + ... + 59324161.

It is an arithmetic number, because the mean of its divisors is an integer number (581242668594).

Almost surely, 2^{6640402573660} is an apocalyptic number.

It is an amenable number.

6640402573660 is an abundant number, since it is smaller than the sum of its proper divisors (7309421472596).

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

6640402573660 is a wasteful number, since it uses less digits than its factorization.

6640402573660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118539093 (or 118539091 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 6640402573660 in words is "six trillion, six hundred forty billion, four hundred two million, five hundred seventy-three thousand, six hundred sixty".