66690417 has 8 divisors (see below), whose sum is σ = 89992224. Its totient is φ = 43924448.

The previous prime is 66690413. The next prime is 66690427. The reversal of 66690417 is 71409666.

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 66690417 - 2² = 66690413 is a prime.

It is a super-2 number, since 2×66690417² = 8895223439267778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66690413) 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, 133668 + ... + 134165.

It is an arithmetic number, because the mean of its divisors is an integer number (11249028).

Almost surely, 2^66690417 is an apocalyptic number.

It is an amenable number.

66690417 is a deficient number, since it is larger than the sum of its proper divisors (23301807).

66690417 is a wasteful number, since it uses less digits than its factorization.

66690417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267919.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 66690417 is about 8166.4200847128. The cubic root of 66690417 is about 405.5282787629.

The spelling of 66690417 in words is "sixty-six million, six hundred ninety thousand, four hundred seventeen".