66401063 has 2 divisors, whose sum is σ = 66401064. Its totient is φ = 66401062.

The previous prime is 66401053. The next prime is 66401077. The reversal of 66401063 is 36010466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66401063 - 2¹⁴ = 66384679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66401003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33200531 + 33200532.

It is an arithmetic number, because the mean of its divisors is an integer number (33200532).

Almost surely, 2^66401063 is an apocalyptic number.

66401063 is a deficient number, since it is larger than the sum of its proper divisors (1).

66401063 is an equidigital number, since it uses as much as digits as its factorization.

66401063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66401063 is about 8148.6847404965. The cubic root of 66401063 is about 404.9409312827.

The spelling of 66401063 in words is "sixty-six million, four hundred one thousand, sixty-three".