125621865852 has 72 divisors (see below), whose sum is σ = 347407186896. Its totient is φ = 35214746112.

The previous prime is 125621865847. The next prime is 125621865883. The reversal of 125621865852 is 258568126521.

It is a junction number, because it is equal to n+sod(n) for n = 125621865795 and 125621865804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1984333 + ... + 2046660.

It is an arithmetic number, because the mean of its divisors is an integer number (4825099818).

Almost surely, 2^125621865852 is an apocalyptic number.

125621865852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

125621865852 is an abundant number, since it is smaller than the sum of its proper divisors (221785321044).

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

125621865852 is a wasteful number, since it uses less digits than its factorization.

125621865852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031067 (or 4031058 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 51.

The spelling of 125621865852 in words is "one hundred twenty-five billion, six hundred twenty-one million, eight hundred sixty-five thousand, eight hundred fifty-two".