66888417 has 8 divisors (see below), whose sum is σ = 93878560. Its totient is φ = 42245280.

The previous prime is 66888407. The next prime is 66888433. The reversal of 66888417 is 71488866.

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

It is not a de Polignac number, because 66888417 - 2²⁰ = 65839841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66888407) 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, 586684 + ... + 586797.

It is an arithmetic number, because the mean of its divisors is an integer number (11734820).

Almost surely, 2^66888417 is an apocalyptic number.

It is an amenable number.

66888417 is a deficient number, since it is larger than the sum of its proper divisors (26990143).

66888417 is a wasteful number, since it uses less digits than its factorization.

66888417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173503.

The product of its digits is 516096, while the sum is 48.

The square root of 66888417 is about 8178.5339150730. The cubic root of 66888417 is about 405.9292122616.

The spelling of 66888417 in words is "sixty-six million, eight hundred eighty-eight thousand, four hundred seventeen".