125655712909 has 2 divisors, whose sum is σ = 125655712910. Its totient is φ = 125655712908.

The previous prime is 125655712907. The next prime is 125655712933. The reversal of 125655712909 is 909217556521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110741197284 + 14914515625 = 332778^2 + 122125^2 .

It is an emirp because it is prime and its reverse (909217556521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125655712909 - 2¹ = 125655712907 is a prime.

Together with 125655712907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125655712901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62827856454 + 62827856455.

It is an arithmetic number, because the mean of its divisors is an integer number (62827856455).

Almost surely, 2^125655712909 is an apocalyptic number.

It is an amenable number.

125655712909 is a deficient number, since it is larger than the sum of its proper divisors (1).

125655712909 is an equidigital number, since it uses as much as digits as its factorization.

125655712909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701000, while the sum is 52.

The spelling of 125655712909 in words is "one hundred twenty-five billion, six hundred fifty-five million, seven hundred twelve thousand, nine hundred nine".