856872889879 has 2 divisors, whose sum is σ = 856872889880. Its totient is φ = 856872889878.

The previous prime is 856872889819. The next prime is 856872889903. The reversal of 856872889879 is 978988278658.

856872889879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856872889879 - 2¹³ = 856872881687 is a prime.

It is a super-2 number, since 2×856872889879² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 856872889796 and 856872889805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856872889819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428436444939 + 428436444940.

It is an arithmetic number, because the mean of its divisors is an integer number (428436444940).

Almost surely, 2^856872889879 is an apocalyptic number.

856872889879 is a deficient number, since it is larger than the sum of its proper divisors (1).

856872889879 is an equidigital number, since it uses as much as digits as its factorization.

856872889879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7803371520, while the sum is 85.

The spelling of 856872889879 in words is "eight hundred fifty-six billion, eight hundred seventy-two million, eight hundred eighty-nine thousand, eight hundred seventy-nine".