66331943 has 8 divisors (see below), whose sum is σ = 71283312. Its totient is φ = 61497216.

The previous prime is 66331939. The next prime is 66331997. The reversal of 66331943 is 34913366.

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

It is a cyclic number.

It is not a de Polignac number, because 66331943 - 2² = 66331939 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66331543) 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, 27980 + ... + 30257.

It is an arithmetic number, because the mean of its divisors is an integer number (8910414).

Almost surely, 2^66331943 is an apocalyptic number.

66331943 is a deficient number, since it is larger than the sum of its proper divisors (4951369).

66331943 is a wasteful number, since it uses less digits than its factorization.

66331943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58321.

The product of its digits is 34992, while the sum is 35.

The square root of 66331943 is about 8144.4424609669. The cubic root of 66331943 is about 404.8003751259.

The spelling of 66331943 in words is "sixty-six million, three hundred thirty-one thousand, nine hundred forty-three".