125129979820 has 24 divisors (see below), whose sum is σ = 263900748384. Its totient is φ = 49837174656.

The previous prime is 125129979787. The next prime is 125129979823. The reversal of 125129979820 is 28979921521.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (125129979823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13421304 + ... + 13430623.

It is an arithmetic number, because the mean of its divisors is an integer number (10995864516).

Almost surely, 2^125129979820 is an apocalyptic number.

125129979820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125129979820 is an abundant number, since it is smaller than the sum of its proper divisors (138770768564).

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

125129979820 is a wasteful number, since it uses less digits than its factorization.

125129979820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26852169 (or 26852167 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 125129979820 in words is "one hundred twenty-five billion, one hundred twenty-nine million, nine hundred seventy-nine thousand, eight hundred twenty".