125621161616 has 20 divisors (see below), whose sum is σ = 251242324224. Its totient is φ = 60784432800.

The previous prime is 125621161591. The next prime is 125621161619. The reversal of 125621161616 is 616161126521.

125621161616 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 125621161616.

It is not an unprimeable number, because it can be changed into a prime (125621161619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126633740 + ... + 126634731.

Almost surely, 2^125621161616 is an apocalyptic number.

125621161616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

125621161616 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

125621161616 is a wasteful number, since it uses less digits than its factorization.

125621161616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253268510 (or 253268504 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The spelling of 125621161616 in words is "one hundred twenty-five billion, six hundred twenty-one million, one hundred sixty-one thousand, six hundred sixteen".