42315856123 has 2 divisors, whose sum is σ = 42315856124. Its totient is φ = 42315856122.

The previous prime is 42315856109. The next prime is 42315856129. The reversal of 42315856123 is 32165851324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42315856123 is a prime.

It is a super-2 number, since 2×42315856123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42315856129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21157928061 + 21157928062.

It is an arithmetic number, because the mean of its divisors is an integer number (21157928062).

Almost surely, 2^42315856123 is an apocalyptic number.

42315856123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42315856123 is an equidigital number, since it uses as much as digits as its factorization.

42315856123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The spelling of 42315856123 in words is "forty-two billion, three hundred fifteen million, eight hundred fifty-six thousand, one hundred twenty-three".