121553137168 has 20 divisors (see below), whose sum is σ = 235574069740. Its totient is φ = 60759828864.

The previous prime is 121553137103. The next prime is 121553137177. The reversal of 121553137168 is 861731355121.

It can be written as a sum of positive squares in 2 ways, for example, as 9454061824 + 112099075344 = 97232^2 + 334812^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986223 + ... + 1102606.

It is an arithmetic number, because the mean of its divisors is an integer number (11778703487).

Almost surely, 2^121553137168 is an apocalyptic number.

It is an amenable number.

121553137168 is a deficient number, since it is larger than the sum of its proper divisors (114020932572).

121553137168 is a wasteful number, since it uses less digits than its factorization.

121553137168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092474 (or 2092468 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The spelling of 121553137168 in words is "one hundred twenty-one billion, five hundred fifty-three million, one hundred thirty-seven thousand, one hundred sixty-eight".