66689630 has 16 divisors (see below), whose sum is σ = 137190240. Its totient is φ = 22864992.

The previous prime is 66689617. The next prime is 66689633. The reversal of 66689630 is 3698666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66689633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476285 + ... + 476424.

It is an arithmetic number, because the mean of its divisors is an integer number (8574390).

Almost surely, 2^66689630 is an apocalyptic number.

66689630 is an abundant number, since it is smaller than the sum of its proper divisors (70500610).

66689630 is a wasteful number, since it uses less digits than its factorization.

66689630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952723.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66689630 is about 8166.3718994422. The cubic root of 66689630 is about 405.5266835711.

The spelling of 66689630 in words is "sixty-six million, six hundred eighty-nine thousand, six hundred thirty".