66881118899 has 16 divisors (see below), whose sum is σ = 76984147968. Its totient is φ = 56916158112.

The previous prime is 66881118893. The next prime is 66881118901. The reversal of 66881118899 is 99881118866.

It is a cyclic number.

It is not a de Polignac number, because 66881118899 - 2⁴ = 66881118883 is a prime.

66881118899 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66881118893) 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, 842414 + ... + 918380.

It is an arithmetic number, because the mean of its divisors is an integer number (4811509248).

Almost surely, 2^66881118899 is an apocalyptic number.

66881118899 is a deficient number, since it is larger than the sum of its proper divisors (10103029069).

66881118899 is a wasteful number, since it uses less digits than its factorization.

66881118899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76874.

The product of its digits is 11943936, while the sum is 65.

The spelling of 66881118899 in words is "sixty-six billion, eight hundred eighty-one million, one hundred eighteen thousand, eight hundred ninety-nine".