125708785726639 has 16 divisors (see below), whose sum is σ = 127941227900640. Its totient is φ = 123500280355200.

The previous prime is 125708785726633. The next prime is 125708785726651. The reversal of 125708785726639 is 936627587807521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125708785726639 - 2¹⁷ = 125708785595567 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 (125708785726633) 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, 3698637 + ... + 16281814.

It is an arithmetic number, because the mean of its divisors is an integer number (7996326743790).

Almost surely, 2^{125708785726639} is an apocalyptic number.

125708785726639 is a deficient number, since it is larger than the sum of its proper divisors (2232442174001).

125708785726639 is a wasteful number, since it uses less digits than its factorization.

125708785726639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19981050.

The product of its (nonzero) digits is 2133734400, while the sum is 76.

The spelling of 125708785726639 in words is "one hundred twenty-five trillion, seven hundred eight billion, seven hundred eighty-five million, seven hundred twenty-six thousand, six hundred thirty-nine".