125138887640 has 32 divisors (see below), whose sum is σ = 303221152080. Its totient is φ = 46205127552.

The previous prime is 125138887639. The next prime is 125138887651. The reversal of 125138887640 is 46788831521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120325334 + ... + 120326373.

Almost surely, 2^125138887640 is an apocalyptic number.

125138887640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125138887640 is an abundant number, since it is smaller than the sum of its proper divisors (178082264440).

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

125138887640 is a wasteful number, since it uses less digits than its factorization.

125138887640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240651731 (or 240651727 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 125138887640 in words is "one hundred twenty-five billion, one hundred thirty-eight million, eight hundred eighty-seven thousand, six hundred forty".