121818889535616 has 192 divisors, whose sum is σ = 431441900809920. Its totient is φ = 32128058750976.

The previous prime is 121818889535501. The next prime is 121818889535639. The reversal of 121818889535616 is 616535988818121.

121818889535616 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 1 + 8 + 8 + 8 + 9 + 53 + 561 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×121818889535616² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 580914750 + ... + 581124413.

It is an arithmetic number, because the mean of its divisors is an integer number (2247093233385).

Almost surely, 2^{121818889535616} is an apocalyptic number.

121818889535616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121818889535616 is an abundant number, since it is smaller than the sum of its proper divisors (309623011274304).

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

121818889535616 is a wasteful number, since it uses less digits than its factorization.

121818889535616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162039203 (or 1162039188 counting only the distinct ones).

The product of its digits is 199065600, while the sum is 72.

The spelling of 121818889535616 in words is "one hundred twenty-one trillion, eight hundred eighteen billion, eight hundred eighty-nine million, five hundred thirty-five thousand, six hundred sixteen".