66888905 has 8 divisors (see below), whose sum is σ = 81283200. Its totient is φ = 52833456.

The previous prime is 66888889. The next prime is 66888907. The reversal of 66888905 is 50988866.

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 66888905 - 2⁴ = 66888889 is a prime.

It is a super-2 number, since 2×66888905² = 8948251224198050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66888907) 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, 84275 + ... + 85064.

It is an arithmetic number, because the mean of its divisors is an integer number (10160400).

Almost surely, 2^66888905 is an apocalyptic number.

It is an amenable number.

66888905 is a deficient number, since it is larger than the sum of its proper divisors (14394295).

66888905 is a wasteful number, since it uses less digits than its factorization.

66888905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169423.

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 66888905 is about 8178.5637492166. The cubic root of 66888905 is about 405.9301994429.

The spelling of 66888905 in words is "sixty-six million, eight hundred eighty-eight thousand, nine hundred five".