125678925889 has 6 divisors (see below), whose sum is σ = 138142951730. Its totient is φ = 114253568880.

The previous prime is 125678925887. The next prime is 125678925923. The reversal of 125678925889 is 988529876521.

It can be written as a sum of positive squares in only one way, i.e., 104210815489 + 21468110400 = 322817^2 + 146520^2 .

It is not a de Polignac number, because 125678925889 - 2¹ = 125678925887 is a prime.

It is a super-2 number, since 2×125678925889² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125678925887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 519334284 + ... + 519334525.

Almost surely, 2^125678925889 is an apocalyptic number.

It is an amenable number.

125678925889 is a deficient number, since it is larger than the sum of its proper divisors (12464025841).

125678925889 is a wasteful number, since it uses less digits than its factorization.

125678925889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038668831 (or 1038668820 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 70.

The spelling of 125678925889 in words is "one hundred twenty-five billion, six hundred seventy-eight million, nine hundred twenty-five thousand, eight hundred eighty-nine".