856872889819 has 2 divisors, whose sum is σ = 856872889820. Its totient is φ = 856872889818.

The previous prime is 856872889811. The next prime is 856872889879. The reversal of 856872889819 is 918988278658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856872889819 - 2³ = 856872889811 is a prime.

It is a super-2 number, since 2×856872889819² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856872889811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428436444909 + 428436444910.

It is an arithmetic number, because the mean of its divisors is an integer number (428436444910).

Almost surely, 2^856872889819 is an apocalyptic number.

856872889819 is a deficient number, since it is larger than the sum of its proper divisors (1).

856872889819 is an equidigital number, since it uses as much as digits as its factorization.

856872889819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1114767360, while the sum is 79.

The spelling of 856872889819 in words is "eight hundred fifty-six billion, eight hundred seventy-two million, eight hundred eighty-nine thousand, eight hundred nineteen".