66234168691 has 2 divisors, whose sum is σ = 66234168692. Its totient is φ = 66234168690.

The previous prime is 66234168641. The next prime is 66234168779. The reversal of 66234168691 is 19686143266.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66234168691 - 2²³ = 66225780083 is a prime.

It is not a weakly prime, because it can be changed into another prime (66234168631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33117084345 + 33117084346.

It is an arithmetic number, because the mean of its divisors is an integer number (33117084346).

Almost surely, 2^66234168691 is an apocalyptic number.

66234168691 is a deficient number, since it is larger than the sum of its proper divisors (1).

66234168691 is an equidigital number, since it uses as much as digits as its factorization.

66234168691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 52.

The spelling of 66234168691 in words is "sixty-six billion, two hundred thirty-four million, one hundred sixty-eight thousand, six hundred ninety-one".