66993143 has 12 divisors (see below), whose sum is σ = 79255080. Its totient is φ = 56446992.

The previous prime is 66993131. The next prime is 66993169. The reversal of 66993143 is 34139966.

It is not a de Polignac number, because 66993143 - 2⁴ = 66993127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66993143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66993193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8696 + ... + 14477.

It is an arithmetic number, because the mean of its divisors is an integer number (6604590).

Almost surely, 2^66993143 is an apocalyptic number.

66993143 is a deficient number, since it is larger than the sum of its proper divisors (12261937).

66993143 is a wasteful number, since it uses less digits than its factorization.

66993143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23246 (or 23239 counting only the distinct ones).

The product of its digits is 104976, while the sum is 41.

The square root of 66993143 is about 8184.9339032151. The cubic root of 66993143 is about 406.1409538329.

The spelling of 66993143 in words is "sixty-six million, nine hundred ninety-three thousand, one hundred forty-three".