66825947 has 4 divisors (see below), whose sum is σ = 69130320. Its totient is φ = 64521576.

The previous prime is 66825931. The next prime is 66825953. The reversal of 66825947 is 74952866.

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 66825947 - 2⁴ = 66825931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66825977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152143 + ... + 1152200.

It is an arithmetic number, because the mean of its divisors is an integer number (17282580).

Almost surely, 2^66825947 is an apocalyptic number.

66825947 is a deficient number, since it is larger than the sum of its proper divisors (2304373).

66825947 is a wasteful number, since it uses less digits than its factorization.

66825947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304372.

The product of its digits is 725760, while the sum is 47.

The square root of 66825947 is about 8174.7138787850. The cubic root of 66825947 is about 405.8028012547.

The spelling of 66825947 in words is "sixty-six million, eight hundred twenty-five thousand, nine hundred forty-seven".