125555051640 has 128 divisors (see below), whose sum is σ = 378194261760. Its totient is φ = 33345675264.

The previous prime is 125555051617. The next prime is 125555051669. The reversal of 125555051640 is 46150555521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59419224 + ... + 59421336.

It is an arithmetic number, because the mean of its divisors is an integer number (2954642670).

Almost surely, 2^125555051640 is an apocalyptic number.

125555051640 is a gapful number since it is divisible by the number (10) 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 125555051640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189097130880).

125555051640 is an abundant number, since it is smaller than the sum of its proper divisors (252639210120).

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

125555051640 is a wasteful number, since it uses less digits than its factorization.

125555051640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3901 (or 3897 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 39.

The spelling of 125555051640 in words is "one hundred twenty-five billion, five hundred fifty-five million, fifty-one thousand, six hundred forty".