66652468891 has 2 divisors, whose sum is σ = 66652468892. Its totient is φ = 66652468890.

The previous prime is 66652468889. The next prime is 66652468919. The reversal of 66652468891 is 19886425666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66652468891 - 2¹ = 66652468889 is a prime.

Together with 66652468889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66652468801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33326234445 + 33326234446.

It is an arithmetic number, because the mean of its divisors is an integer number (33326234446).

Almost surely, 2^66652468891 is an apocalyptic number.

66652468891 is a deficient number, since it is larger than the sum of its proper divisors (1).

66652468891 is an equidigital number, since it uses as much as digits as its factorization.

66652468891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29859840, while the sum is 61.

The spelling of 66652468891 in words is "sixty-six billion, six hundred fifty-two million, four hundred sixty-eight thousand, eight hundred ninety-one".