125691603785 has 12 divisors (see below), whose sum is σ = 165788264964. Its totient is φ = 91412075040.

The previous prime is 125691603749. The next prime is 125691603787. The reversal of 125691603785 is 587306196521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53274640969 + 72416962816 = 230813^2 + 269104^2 .

It is not a de Polignac number, because 125691603785 - 2²⁶ = 125624494921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125691603787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103876754 + ... + 103877963.

It is an arithmetic number, because the mean of its divisors is an integer number (13815688747).

Almost surely, 2^125691603785 is an apocalyptic number.

It is an amenable number.

125691603785 is a deficient number, since it is larger than the sum of its proper divisors (40096661179).

125691603785 is a wasteful number, since it uses less digits than its factorization.

125691603785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207754744 (or 207754733 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 125691603785 in words is "one hundred twenty-five billion, six hundred ninety-one million, six hundred three thousand, seven hundred eighty-five".