66502688940 has 72 divisors (see below), whose sum is σ = 203313277440. Its totient is φ = 17594406144.

The previous prime is 66502688881. The next prime is 66502688953. The reversal of 66502688940 is 4988620566.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1431705 + ... + 1477424.

It is an arithmetic number, because the mean of its divisors is an integer number (2823795520).

Almost surely, 2^66502688940 is an apocalyptic number.

66502688940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66502688940 is an abundant number, since it is smaller than the sum of its proper divisors (136810588500).

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

66502688940 is a wasteful number, since it uses less digits than its factorization.

66502688940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909271 (or 2909266 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 66502688940 in words is "sixty-six billion, five hundred two million, six hundred eighty-eight thousand, nine hundred forty".