66544143 has 8 divisors (see below), whose sum is σ = 89722800. Its totient is φ = 43864128.

The previous prime is 66544139. The next prime is 66544147. The reversal of 66544143 is 34144566.

It is an interprime number because it is at equal distance from previous prime (66544139) and next prime (66544147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66544143 - 2² = 66544139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66544147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124348 + ... + 124881.

It is an arithmetic number, because the mean of its divisors is an integer number (11215350).

Almost surely, 2^66544143 is an apocalyptic number.

66544143 is a deficient number, since it is larger than the sum of its proper divisors (23178657).

66544143 is a wasteful number, since it uses less digits than its factorization.

66544143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249321.

The product of its digits is 34560, while the sum is 33.

The square root of 66544143 is about 8157.4593471252. The cubic root of 66544143 is about 405.2315761422.

The spelling of 66544143 in words is "sixty-six million, five hundred forty-four thousand, one hundred forty-three".