66904117 has 16 divisors (see below), whose sum is σ = 77807232. Its totient is φ = 56347200.

The previous prime is 66904099. The next prime is 66904121. The reversal of 66904117 is 71140966.

It is a de Polignac number, because none of the positive numbers 2^k-66904117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66904127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122038 + ... + 122584.

It is an arithmetic number, because the mean of its divisors is an integer number (4862952).

Almost surely, 2^66904117 is an apocalyptic number.

It is an amenable number.

66904117 is a deficient number, since it is larger than the sum of its proper divisors (10903115).

66904117 is a wasteful number, since it uses less digits than its factorization.

66904117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 66904117 is about 8179.4936884871. The cubic root of 66904117 is about 405.9609695790.

The spelling of 66904117 in words is "sixty-six million, nine hundred four thousand, one hundred seventeen".