66189707 has 4 divisors (see below), whose sum is σ = 67978656. Its totient is φ = 64400760.

The previous prime is 66189701. The next prime is 66189719. The reversal of 66189707 is 70798166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66189707 - 2⁴ = 66189691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66189701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894419 + ... + 894492.

It is an arithmetic number, because the mean of its divisors is an integer number (16994664).

Almost surely, 2^66189707 is an apocalyptic number.

66189707 is a deficient number, since it is larger than the sum of its proper divisors (1788949).

66189707 is a wasteful number, since it uses less digits than its factorization.

66189707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788948.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 66189707 is about 8135.7056854338. The cubic root of 66189707 is about 404.5108294108.

The spelling of 66189707 in words is "sixty-six million, one hundred eighty-nine thousand, seven hundred seven".