66775732857 has 16 divisors (see below), whose sum is σ = 99802476480. Its totient is φ = 44123196096.

The previous prime is 66775732853. The next prime is 66775732901. The reversal of 66775732857 is 75823757766.

66775732857 is a `hidden beast` number, since 6 + 6 + 7 + 7 + 573 + 2 + 8 + 57 = 666.

66775732857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66775732857 - 2² = 66775732853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66775732794 and 66775732803.

It is not an unprimeable number, because it can be changed into a prime (66775732853) 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, 10940203 + ... + 10946304.

It is an arithmetic number, because the mean of its divisors is an integer number (6237654780).

Almost surely, 2^66775732857 is an apocalyptic number.

It is an amenable number.

66775732857 is a deficient number, since it is larger than the sum of its proper divisors (33026743623).

66775732857 is a wasteful number, since it uses less digits than its factorization.

66775732857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21886629 (or 21886623 counting only the distinct ones).

The product of its digits is 103723200, while the sum is 63.

The spelling of 66775732857 in words is "sixty-six billion, seven hundred seventy-five million, seven hundred thirty-two thousand, eight hundred fifty-seven".