66724963 has 2 divisors, whose sum is σ = 66724964. Its totient is φ = 66724962.

The previous prime is 66724939. The next prime is 66724967. The reversal of 66724963 is 36942766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66724963 - 2²¹ = 64627811 is a prime.

It is not a weakly prime, because it can be changed into another prime (66724967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33362481 + 33362482.

It is an arithmetic number, because the mean of its divisors is an integer number (33362482).

Almost surely, 2^66724963 is an apocalyptic number.

66724963 is a deficient number, since it is larger than the sum of its proper divisors (1).

66724963 is an equidigital number, since it uses as much as digits as its factorization.

66724963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 43.

The square root of 66724963 is about 8168.5349359601. The cubic root of 66724963 is about 405.5982886297.

The spelling of 66724963 in words is "sixty-six million, seven hundred twenty-four thousand, nine hundred sixty-three".