121761536565 has 8 divisors (see below), whose sum is σ = 194818458528. Its totient is φ = 64939486160.

The previous prime is 121761536539. The next prime is 121761536569. The reversal of 121761536565 is 565635167121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121761536565 - 2¹⁰ = 121761535541 is a prime.

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, 4058717871 + ... + 4058717900.

It is an arithmetic number, because the mean of its divisors is an integer number (24352307316).

Almost surely, 2^121761536565 is an apocalyptic number.

121761536565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121761536565 is a deficient number, since it is larger than the sum of its proper divisors (73056921963).

121761536565 is an equidigital number, since it uses as much as digits as its factorization.

121761536565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8117435779.

The product of its digits is 1134000, while the sum is 48.

The spelling of 121761536565 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred thirty-six thousand, five hundred sixty-five".