64858966891 has 2 divisors, whose sum is σ = 64858966892. Its totient is φ = 64858966890.

The previous prime is 64858966841. The next prime is 64858966919. The reversal of 64858966891 is 19866985846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64858966891 - 2⁹ = 64858966379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64858966891.

It is not a weakly prime, because it can be changed into another prime (64858966841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32429483445 + 32429483446.

It is an arithmetic number, because the mean of its divisors is an integer number (32429483446).

Almost surely, 2^64858966891 is an apocalyptic number.

64858966891 is a deficient number, since it is larger than the sum of its proper divisors (1).

64858966891 is an equidigital number, since it uses as much as digits as its factorization.

64858966891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 179159040, while the sum is 70.

The spelling of 64858966891 in words is "sixty-four billion, eight hundred fifty-eight million, nine hundred sixty-six thousand, eight hundred ninety-one".