66205693407788 has 48 divisors (see below), whose sum is σ = 128149972014624. Its totient is φ = 29675262435840.

The previous prime is 66205693407787. The next prime is 66205693407811. The reversal of 66205693407788 is 88770439650266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66205693407787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13842806 + ... + 18000962.

It is an arithmetic number, because the mean of its divisors is an integer number (2669791083638).

Almost surely, 2^{66205693407788} is an apocalyptic number.

It is an amenable number.

66205693407788 is a deficient number, since it is larger than the sum of its proper divisors (61944278606836).

66205693407788 is a wasteful number, since it uses less digits than its factorization.

66205693407788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163202 (or 4163200 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 71.

The spelling of 66205693407788 in words is "sixty-six trillion, two hundred five billion, six hundred ninety-three million, four hundred seven thousand, seven hundred eighty-eight".