121688653365 has 24 divisors (see below), whose sum is σ = 210955956120. Its totient is φ = 64891705344.

The previous prime is 121688653349. The next prime is 121688653367. The reversal of 121688653365 is 563356886121.

It is a happy number.

121688653365 is a `hidden beast` number, since 1 + 21 + 6 + 8 + 86 + 533 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13289017284 + 108399636081 = 115278^2 + 329241^2 .

It is not a de Polignac number, because 121688653365 - 2⁴ = 121688653349 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121688653367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152581 + ... + 516389.

It is an arithmetic number, because the mean of its divisors is an integer number (8789831505).

Almost surely, 2^121688653365 is an apocalyptic number.

121688653365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121688653365 is a deficient number, since it is larger than the sum of its proper divisors (89267302755).

121688653365 is a wasteful number, since it uses less digits than its factorization.

121688653365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371253 (or 371250 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 121688653365 in words is "one hundred twenty-one billion, six hundred eighty-eight million, six hundred fifty-three thousand, three hundred sixty-five".