64857678619843 has 2 divisors, whose sum is σ = 64857678619844. Its totient is φ = 64857678619842.

The previous prime is 64857678619819. The next prime is 64857678619847. The reversal of 64857678619843 is 34891687675846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64857678619843 is a prime.

It is not a weakly prime, because it can be changed into another prime (64857678619847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32428839309921 + 32428839309922.

It is an arithmetic number, because the mean of its divisors is an integer number (32428839309922).

Almost surely, 2^{64857678619843} is an apocalyptic number.

64857678619843 is a deficient number, since it is larger than the sum of its proper divisors (1).

64857678619843 is an equidigital number, since it uses as much as digits as its factorization.

64857678619843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11705057280, while the sum is 82.

The spelling of 64857678619843 in words is "sixty-four trillion, eight hundred fifty-seven billion, six hundred seventy-eight million, six hundred nineteen thousand, eight hundred forty-three".