66356663 has 2 divisors, whose sum is σ = 66356664. Its totient is φ = 66356662.

The previous prime is 66356657. The next prime is 66356701. The reversal of 66356663 is 36665366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66356663 - 2¹⁸ = 66094519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66356663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66356623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33178331 + 33178332.

It is an arithmetic number, because the mean of its divisors is an integer number (33178332).

Almost surely, 2^66356663 is an apocalyptic number.

66356663 is a deficient number, since it is larger than the sum of its proper divisors (1).

66356663 is an equidigital number, since it uses as much as digits as its factorization.

66356663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 41.

The square root of 66356663 is about 8145.9599188800. The cubic root of 66356663 is about 404.8506546846.

The spelling of 66356663 in words is "sixty-six million, three hundred fifty-six thousand, six hundred sixty-three".