121687250568 has 64 divisors (see below), whose sum is σ = 330681476160. Its totient is φ = 37092293376.

The previous prime is 121687250543. The next prime is 121687250569. The reversal of 121687250568 is 865052786121.

It is a self number, because there is not a number n which added to its sum of digits gives 121687250568.

It is not an unprimeable number, because it can be changed into a prime (121687250569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1789155 + ... + 1855922.

It is an arithmetic number, because the mean of its divisors is an integer number (5166898065).

Almost surely, 2^121687250568 is an apocalyptic number.

It is an amenable number.

121687250568 is an abundant number, since it is smaller than the sum of its proper divisors (208994225592).

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

121687250568 is a wasteful number, since it uses less digits than its factorization.

121687250568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645206 (or 3645202 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 121687250568 in words is "one hundred twenty-one billion, six hundred eighty-seven million, two hundred fifty thousand, five hundred sixty-eight".