66923417 has 8 divisors (see below), whose sum is σ = 74980992. Its totient is φ = 59194800.

The previous prime is 66923411. The next prime is 66923447. The reversal of 66923417 is 71432966.

It is a Cunningham number, because it is equal to 406³+1.

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 66923417 - 2²⁰ = 65874841 is a prime.

It is a super-3 number, since 3×66923417³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66923411) 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, 81809 + ... + 82622.

It is an arithmetic number, because the mean of its divisors is an integer number (9372624).

Almost surely, 2^66923417 is an apocalyptic number.

It is an amenable number.

66923417 is a deficient number, since it is larger than the sum of its proper divisors (8057575).

66923417 is a wasteful number, since it uses less digits than its factorization.

66923417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164479.

The product of its digits is 54432, while the sum is 38.

The square root of 66923417 is about 8180.6733830413. The cubic root of 66923417 is about 406.0000020222. Note that the first 5 decimals are identical.

The spelling of 66923417 in words is "sixty-six million, nine hundred twenty-three thousand, four hundred seventeen".