66844963 has 8 divisors (see below), whose sum is σ = 68418000. Its totient is φ = 65290368.

The previous prime is 66844937. The next prime is 66845027. The reversal of 66844963 is 36944866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66844963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66844363) 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, 2863 + ... + 11911.

It is an arithmetic number, because the mean of its divisors is an integer number (8552250).

Almost surely, 2^66844963 is an apocalyptic number.

66844963 is a deficient number, since it is larger than the sum of its proper divisors (1573037).

66844963 is an equidigital number, since it uses as much as digits as its factorization.

66844963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221.

The product of its digits is 746496, while the sum is 46.

The square root of 66844963 is about 8175.8768948658. The cubic root of 66844963 is about 405.8412893699.

The spelling of 66844963 in words is "sixty-six million, eight hundred forty-four thousand, nine hundred sixty-three".