121568787408 has 80 divisors (see below), whose sum is σ = 341981236800. Its totient is φ = 37066337280.

The previous prime is 121568787349. The next prime is 121568787409. The reversal of 121568787408 is 804787865121.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121568787409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2271813 + ... + 2324708.

It is an arithmetic number, because the mean of its divisors is an integer number (4274765460).

Almost surely, 2^121568787408 is an apocalyptic number.

It is an amenable number.

121568787408 is an abundant number, since it is smaller than the sum of its proper divisors (220412449392).

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

121568787408 is a wasteful number, since it uses less digits than its factorization.

121568787408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4596580 (or 4596574 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 57.

The spelling of 121568787408 in words is "one hundred twenty-one billion, five hundred sixty-eight million, seven hundred eighty-seven thousand, four hundred eight".