66689001 has 40 divisors (see below), whose sum is σ = 104648544. Its totient is φ = 42275520.

The previous prime is 66688991. The next prime is 66689017. The reversal of 66689001 is 10098666.

It is not a de Polignac number, because 66689001 - 2⁵ = 66688969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66689041) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 142570 + ... + 143036.

Almost surely, 2^66689001 is an apocalyptic number.

It is an amenable number.

66689001 is a deficient number, since it is larger than the sum of its proper divisors (37959543).

66689001 is a wasteful number, since it uses less digits than its factorization.

66689001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 66689001 is about 8166.3333877573. Note that the first 4 decimals coincide. The cubic root of 66689001 is about 405.5254086249.

The spelling of 66689001 in words is "sixty-six million, six hundred eighty-nine thousand, one".