66668475 has 24 divisors (see below), whose sum is σ = 116711280. Its totient is φ = 33464320.

The previous prime is 66668449. The next prime is 66668479. The reversal of 66668475 is 57486666.

It is not a de Polignac number, because 66668475 - 2⁵ = 66668443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66668479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24870 + ... + 27419.

It is an arithmetic number, because the mean of its divisors is an integer number (4862970).

Almost surely, 2^66668475 is an apocalyptic number.

66668475 is a deficient number, since it is larger than the sum of its proper divisors (50042805).

66668475 is a wasteful number, since it uses less digits than its factorization.

66668475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52319 (or 52314 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The square root of 66668475 is about 8165.0765458751. The cubic root of 66668475 is about 405.4837992213.

The spelling of 66668475 in words is "sixty-six million, six hundred sixty-eight thousand, four hundred seventy-five".