125640040689 has 12 divisors (see below), whose sum is σ = 181521389556. Its totient is φ = 83740951392.

The previous prime is 125640040663. The next prime is 125640040723. The reversal of 125640040689 is 986040046521.

125640040689 is a `hidden beast` number, since 1 + 2 + 564 + 0 + 0 + 4 + 0 + 6 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54133002225 + 71507038464 = 232665^2 + 267408^2 .

It is not a de Polignac number, because 125640040689 - 2⁵ = 125640040657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125640040639) 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, 1547874 + ... + 1627019.

It is an arithmetic number, because the mean of its divisors is an integer number (15126782463).

Almost surely, 2^125640040689 is an apocalyptic number.

It is an amenable number.

125640040689 is a deficient number, since it is larger than the sum of its proper divisors (55881348867).

125640040689 is a wasteful number, since it uses less digits than its factorization.

125640040689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3179296 (or 3179293 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 125640040689 in words is "one hundred twenty-five billion, six hundred forty million, forty thousand, six hundred eighty-nine".