121616545554 has 40 divisors (see below), whose sum is σ = 311441315328. Its totient is φ = 34747584120.

The previous prime is 121616545549. The next prime is 121616545571. The reversal of 121616545554 is 455545616121.

121616545554 is a `hidden beast` number, since 1 + 21 + 616 + 5 + 4 + 5 + 5 + 5 + 4 = 666.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 53621682 + ... + 53623949.

Almost surely, 2^121616545554 is an apocalyptic number.

121616545554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121616545554 is an abundant number, since it is smaller than the sum of its proper divisors (189824769774).

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

121616545554 is a wasteful number, since it uses less digits than its factorization.

121616545554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107245652 (or 107245643 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The spelling of 121616545554 in words is "one hundred twenty-one billion, six hundred sixteen million, five hundred forty-five thousand, five hundred fifty-four".