66666672897 has 32 divisors (see below), whose sum is σ = 98731906944. Its totient is φ = 39672115200.

The previous prime is 66666672889. The next prime is 66666672899. The reversal of 66666672897 is 79827666666.

It is not a de Polignac number, because 66666672897 - 2³ = 66666672889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66666672899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1132803 + ... + 1190199.

It is an arithmetic number, because the mean of its divisors is an integer number (3085372092).

Almost surely, 2^66666672897 is an apocalyptic number.

It is an amenable number.

66666672897 is a deficient number, since it is larger than the sum of its proper divisors (32065234047).

66666672897 is a wasteful number, since it uses less digits than its factorization.

66666672897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58049.

The product of its digits is 329204736, while the sum is 69.

The spelling of 66666672897 in words is "sixty-six billion, six hundred sixty-six million, six hundred seventy-two thousand, eight hundred ninety-seven".