125809055861 has 16 divisors (see below), whose sum is σ = 131501772480. Its totient is φ = 120240236160.

The previous prime is 125809055857. The next prime is 125809055891. The reversal of 125809055861 is 168550908521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125809055861 - 2² = 125809055857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125809055821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2861930 + ... + 2905556.

It is an arithmetic number, because the mean of its divisors is an integer number (8218860780).

Almost surely, 2^125809055861 is an apocalyptic number.

It is an amenable number.

125809055861 is a deficient number, since it is larger than the sum of its proper divisors (5692716619).

125809055861 is a wasteful number, since it uses less digits than its factorization.

125809055861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45044.

The product of its (nonzero) digits is 864000, while the sum is 50.

The spelling of 125809055861 in words is "one hundred twenty-five billion, eight hundred nine million, fifty-five thousand, eight hundred sixty-one".