125918721586123 has 2 divisors, whose sum is σ = 125918721586124. Its totient is φ = 125918721586122.

The previous prime is 125918721586079. The next prime is 125918721586139. The reversal of 125918721586123 is 321685127819521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125918721586123 is a prime.

It is a super-2 number, since 2×125918721586123² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125918721586153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62959360793061 + 62959360793062.

It is an arithmetic number, because the mean of its divisors is an integer number (62959360793062).

Almost surely, 2^{125918721586123} is an apocalyptic number.

125918721586123 is a deficient number, since it is larger than the sum of its proper divisors (1).

125918721586123 is an equidigital number, since it uses as much as digits as its factorization.

125918721586123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 61.

The spelling of 125918721586123 in words is "one hundred twenty-five trillion, nine hundred eighteen billion, seven hundred twenty-one million, five hundred eighty-six thousand, one hundred twenty-three".