125499156656 has 80 divisors (see below), whose sum is σ = 257383526400. Its totient is φ = 59159654400.

The previous prime is 125499156637. The next prime is 125499156659. The reversal of 125499156656 is 656651994521.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 125499156595 and 125499156604.

It is not an unprimeable number, because it can be changed into a prime (125499156659) 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, 13709681 + ... + 13718831.

It is an arithmetic number, because the mean of its divisors is an integer number (3217294080).

Almost surely, 2^125499156656 is an apocalyptic number.

125499156656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125499156656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128691763200).

125499156656 is an abundant number, since it is smaller than the sum of its proper divisors (131884369744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125499156656 is a wasteful number, since it uses less digits than its factorization.

125499156656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9714 (or 9708 counting only the distinct ones).

The product of its digits is 17496000, while the sum is 59.

The spelling of 125499156656 in words is "one hundred twenty-five billion, four hundred ninety-nine million, one hundred fifty-six thousand, six hundred fifty-six".