121761536566 has 16 divisors (see below), whose sum is σ = 183552922800. Its totient is φ = 60577590528.

The previous prime is 121761536539. The next prime is 121761536569. The reversal of 121761536566 is 665635167121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121761536569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590350 + ... + 769438.

It is an arithmetic number, because the mean of its divisors is an integer number (11472057675).

Almost surely, 2^121761536566 is an apocalyptic number.

121761536566 is a deficient number, since it is larger than the sum of its proper divisors (61791386234).

121761536566 is a wasteful number, since it uses less digits than its factorization.

121761536566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180783.

The product of its digits is 1360800, while the sum is 49.

The spelling of 121761536566 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred thirty-six thousand, five hundred sixty-six".