66800963 has 2 divisors, whose sum is σ = 66800964. Its totient is φ = 66800962.

The previous prime is 66800869. The next prime is 66800969. The reversal of 66800963 is 36900866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66800963 - 2¹⁴ = 66784579 is a prime.

It is not a weakly prime, because it can be changed into another prime (66800969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400481 + 33400482.

It is an arithmetic number, because the mean of its divisors is an integer number (33400482).

Almost surely, 2^66800963 is an apocalyptic number.

66800963 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800963 is an equidigital number, since it uses as much as digits as its factorization.

66800963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 66800963 is about 8173.1856090511. The cubic root of 66800963 is about 405.7522228921.

The spelling of 66800963 in words is "sixty-six million, eight hundred thousand, nine hundred sixty-three".