66842863 has 2 divisors, whose sum is σ = 66842864. Its totient is φ = 66842862.

The previous prime is 66842837. The next prime is 66842959. The reversal of 66842863 is 36824866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66842863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66842813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33421431 + 33421432.

It is an arithmetic number, because the mean of its divisors is an integer number (33421432).

Almost surely, 2^66842863 is an apocalyptic number.

66842863 is a deficient number, since it is larger than the sum of its proper divisors (1).

66842863 is an equidigital number, since it uses as much as digits as its factorization.

66842863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 43.

The square root of 66842863 is about 8175.7484672659. The cubic root of 66842863 is about 405.8370393581.

The spelling of 66842863 in words is "sixty-six million, eight hundred forty-two thousand, eight hundred sixty-three".