66125143 has 4 divisors (see below), whose sum is σ = 75571600. Its totient is φ = 56678688.

The previous prime is 66125141. The next prime is 66125173. The reversal of 66125143 is 34152166.

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 66125143 - 2¹ = 66125141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66125141) 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, 4723218 + ... + 4723231.

It is an arithmetic number, because the mean of its divisors is an integer number (18892900).

Almost surely, 2^66125143 is an apocalyptic number.

66125143 is a deficient number, since it is larger than the sum of its proper divisors (9446457).

66125143 is an equidigital number, since it uses as much as digits as its factorization.

66125143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446456.

The product of its digits is 4320, while the sum is 28.

The square root of 66125143 is about 8131.7367763596. The cubic root of 66125143 is about 404.3792614537.

The spelling of 66125143 in words is "sixty-six million, one hundred twenty-five thousand, one hundred forty-three".