856654919123 has 2 divisors, whose sum is σ = 856654919124. Its totient is φ = 856654919122.

The previous prime is 856654919039. The next prime is 856654919143. The reversal of 856654919123 is 321919456658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856654919123 is a prime.

It is not a weakly prime, because it can be changed into another prime (856654919143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428327459561 + 428327459562.

It is an arithmetic number, because the mean of its divisors is an integer number (428327459562).

Almost surely, 2^856654919123 is an apocalyptic number.

856654919123 is a deficient number, since it is larger than the sum of its proper divisors (1).

856654919123 is an equidigital number, since it uses as much as digits as its factorization.

856654919123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13996800, while the sum is 59.

The spelling of 856654919123 in words is "eight hundred fifty-six billion, six hundred fifty-four million, nine hundred nineteen thousand, one hundred twenty-three".