66989417 has 8 divisors (see below), whose sum is σ = 73146240. Its totient is φ = 60843760.

The previous prime is 66989413. The next prime is 66989437. The reversal of 66989417 is 71498966.

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 66989417 - 2² = 66989413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66989413) 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, 14384 + ... + 18462.

It is an arithmetic number, because the mean of its divisors is an integer number (9143280).

Almost surely, 2^66989417 is an apocalyptic number.

It is an amenable number.

66989417 is a deficient number, since it is larger than the sum of its proper divisors (6156823).

66989417 is a wasteful number, since it uses less digits than its factorization.

66989417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583.

The product of its digits is 653184, while the sum is 50.

The square root of 66989417 is about 8184.7062867277. The cubic root of 66989417 is about 406.1334241605.

The spelling of 66989417 in words is "sixty-six million, nine hundred eighty-nine thousand, four hundred seventeen".