66689436969 has 16 divisors (see below), whose sum is σ = 104610882240. Its totient is φ = 41844352320.

The previous prime is 66689436959. The next prime is 66689437027. The reversal of 66689436969 is 96963498666.

It is not a de Polignac number, because 66689436969 - 2⁷ = 66689436841 is a prime.

It is a super-2 number, since 2×66689436969² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66689436897 and 66689436906.

It is not an unprimeable number, because it can be changed into a prime (66689436949) 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, 72645987 + ... + 72646904.

It is an arithmetic number, because the mean of its divisors is an integer number (6538180140).

Almost surely, 2^66689436969 is an apocalyptic number.

It is an amenable number.

66689436969 is a deficient number, since it is larger than the sum of its proper divisors (37921445271).

66689436969 is a wasteful number, since it uses less digits than its factorization.

66689436969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145292917 (or 145292911 counting only the distinct ones).

The product of its digits is 544195584, while the sum is 72.

The spelling of 66689436969 in words is "sixty-six billion, six hundred eighty-nine million, four hundred thirty-six thousand, nine hundred sixty-nine".