66888475 has 12 divisors (see below), whose sum is σ = 83304936. Its totient is φ = 53276480.

The previous prime is 66888457. The next prime is 66888511. The reversal of 66888475 is 57488866.

It is not a de Polignac number, because 66888475 - 2¹³ = 66880283 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84 + ... + 11566.

It is an arithmetic number, because the mean of its divisors is an integer number (6942078).

Almost surely, 2^66888475 is an apocalyptic number.

66888475 is a deficient number, since it is larger than the sum of its proper divisors (16416461).

66888475 is a wasteful number, since it uses less digits than its factorization.

66888475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11726 (or 11721 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The square root of 66888475 is about 8178.5374609401. The cubic root of 66888475 is about 405.9293295908.

The spelling of 66888475 in words is "sixty-six million, eight hundred eighty-eight thousand, four hundred seventy-five".