121565065998 has 16 divisors (see below), whose sum is σ = 243145181520. Its totient is φ = 40519180416.

The previous prime is 121565065907. The next prime is 121565066003. The reversal of 121565065998 is 899560565121.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520665 + ... + 717092.

It is an arithmetic number, because the mean of its divisors is an integer number (15196573845).

Almost surely, 2^121565065998 is an apocalyptic number.

121565065998 is an abundant number, since it is smaller than the sum of its proper divisors (121580115522).

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

121565065998 is a wasteful number, since it uses less digits than its factorization.

121565065998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254131.

The product of its (nonzero) digits is 5832000, while the sum is 57.

The spelling of 121565065998 in words is "one hundred twenty-one billion, five hundred sixty-five million, sixty-five thousand, nine hundred ninety-eight".