121725725688 has 96 divisors (see below), whose sum is σ = 393151449600. Its totient is φ = 33266654784.

The previous prime is 121725725669. The next prime is 121725725701. The reversal of 121725725688 is 886527527121.

It is a happy number.

121725725688 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 2 + 5 + 72 + 568 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5238828 + ... + 5262011.

It is an arithmetic number, because the mean of its divisors is an integer number (4095327600).

Almost surely, 2^121725725688 is an apocalyptic number.

121725725688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121725725688 is an abundant number, since it is smaller than the sum of its proper divisors (271425723912).

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

121725725688 is a wasteful number, since it uses less digits than its factorization.

121725725688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500881 (or 10500874 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The spelling of 121725725688 in words is "one hundred twenty-one billion, seven hundred twenty-five million, seven hundred twenty-five thousand, six hundred eighty-eight".