66264610891 has 2 divisors, whose sum is σ = 66264610892. Its totient is φ = 66264610890.

The previous prime is 66264610889. The next prime is 66264610927. The reversal of 66264610891 is 19801646266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66264610891 - 2¹ = 66264610889 is a prime.

Together with 66264610889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66264610831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33132305445 + 33132305446.

It is an arithmetic number, because the mean of its divisors is an integer number (33132305446).

Almost surely, 2^66264610891 is an apocalyptic number.

66264610891 is a deficient number, since it is larger than the sum of its proper divisors (1).

66264610891 is an equidigital number, since it uses as much as digits as its factorization.

66264610891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 66264610891 in words is "sixty-six billion, two hundred sixty-four million, six hundred ten thousand, eight hundred ninety-one".