64858966691 has 2 divisors, whose sum is σ = 64858966692. Its totient is φ = 64858966690.

The previous prime is 64858966649. The next prime is 64858966759. The reversal of 64858966691 is 19666985846.

It is an a-pointer prime, because the next prime (64858966759) can be obtained adding 64858966691 to its sum of digits (68).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64858966691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (64858966891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32429483345 + 32429483346.

It is an arithmetic number, because the mean of its divisors is an integer number (32429483346).

Almost surely, 2^64858966691 is an apocalyptic number.

64858966691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64858966691 is an equidigital number, since it uses as much as digits as its factorization.

64858966691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134369280, while the sum is 68.

The spelling of 64858966691 in words is "sixty-four billion, eight hundred fifty-eight million, nine hundred sixty-six thousand, six hundred ninety-one".