66608883121 has 16 divisors (see below), whose sum is σ = 72840582720. Its totient is φ = 60406758720.

The previous prime is 66608883109. The next prime is 66608883127. The reversal of 66608883121 is 12138880666.

66608883121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-66608883121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66608883127) 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, 9109615 + ... + 9116923.

It is an arithmetic number, because the mean of its divisors is an integer number (4552536420).

Almost surely, 2^66608883121 is an apocalyptic number.

It is an amenable number.

66608883121 is a deficient number, since it is larger than the sum of its proper divisors (6231699599).

66608883121 is a wasteful number, since it uses less digits than its factorization.

66608883121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9216.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 66608883121 in words is "sixty-six billion, six hundred eight million, eight hundred eighty-three thousand, one hundred twenty-one".