66679617 has 8 divisors (see below), whose sum is σ = 90413280. Its totient is φ = 43699520.

The previous prime is 66679603. The next prime is 66679621. The reversal of 66679617 is 71697666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66679617 - 2²⁴ = 49902401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66677617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188184 + ... + 188537.

It is an arithmetic number, because the mean of its divisors is an integer number (11301660).

Almost surely, 2^66679617 is an apocalyptic number.

It is an amenable number.

66679617 is a deficient number, since it is larger than the sum of its proper divisors (23733663).

66679617 is a wasteful number, since it uses less digits than its factorization.

66679617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376783.

The product of its digits is 571536, while the sum is 48.

The square root of 66679617 is about 8165.7588134845. The cubic root of 66679617 is about 405.5063868527.

The spelling of 66679617 in words is "sixty-six million, six hundred seventy-nine thousand, six hundred seventeen".