66712875 has 32 divisors (see below), whose sum is σ = 112577088. Its totient is φ = 35078400.

The previous prime is 66712873. The next prime is 66712889. The reversal of 66712875 is 57821766.

It is not a de Polignac number, because 66712875 - 2¹ = 66712873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66712871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26157 + ... + 28593.

It is an arithmetic number, because the mean of its divisors is an integer number (3518034).

Almost surely, 2^66712875 is an apocalyptic number.

66712875 is a deficient number, since it is larger than the sum of its proper divisors (45864213).

66712875 is a wasteful number, since it uses less digits than its factorization.

66712875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528 (or 2518 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 66712875 is about 8167.7949900815. The cubic root of 66712875 is about 405.5737942077.

The spelling of 66712875 in words is "sixty-six million, seven hundred twelve thousand, eight hundred seventy-five".