125285557861 has 2 divisors, whose sum is σ = 125285557862. Its totient is φ = 125285557860.

The previous prime is 125285557847. The next prime is 125285557871. The reversal of 125285557861 is 168755582521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85545135361 + 39740422500 = 292481^2 + 199350^2 .

It is a cyclic number.

It is not a de Polignac number, because 125285557861 - 2³³ = 116695623269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125285557801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62642778930 + 62642778931.

It is an arithmetic number, because the mean of its divisors is an integer number (62642778931).

Almost surely, 2^125285557861 is an apocalyptic number.

It is an amenable number.

125285557861 is a deficient number, since it is larger than the sum of its proper divisors (1).

125285557861 is an equidigital number, since it uses as much as digits as its factorization.

125285557861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720000, while the sum is 55.

The spelling of 125285557861 in words is "one hundred twenty-five billion, two hundred eighty-five million, five hundred fifty-seven thousand, eight hundred sixty-one".