125126277779 has 2 divisors, whose sum is σ = 125126277780. Its totient is φ = 125126277778.

The previous prime is 125126277739. The next prime is 125126277797. The reversal of 125126277779 is 977772621521.

Together with next prime (125126277797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (977772621521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125126277779 - 2¹² = 125126273683 is a prime.

It is not a weakly prime, because it can be changed into another prime (125126277719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62563138889 + 62563138890.

It is an arithmetic number, because the mean of its divisors is an integer number (62563138890).

Almost surely, 2^125126277779 is an apocalyptic number.

125126277779 is a deficient number, since it is larger than the sum of its proper divisors (1).

125126277779 is an equidigital number, since it uses as much as digits as its factorization.

125126277779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5186160, while the sum is 56.

The spelling of 125126277779 in words is "one hundred twenty-five billion, one hundred twenty-six million, two hundred seventy-seven thousand, seven hundred seventy-nine".