121761566155 has 8 divisors (see below), whose sum is σ = 151152289200. Its totient is φ = 94050313056.

The previous prime is 121761566153. The next prime is 121761566159. The reversal of 121761566155 is 551665167121.

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

It is a cyclic number.

It is not a de Polignac number, because 121761566155 - 2¹ = 121761566153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121761566153) 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, 419867325 + ... + 419867614.

It is an arithmetic number, because the mean of its divisors is an integer number (18894036150).

Almost surely, 2^121761566155 is an apocalyptic number.

121761566155 is a deficient number, since it is larger than the sum of its proper divisors (29390723045).

121761566155 is an equidigital number, since it uses as much as digits as its factorization.

121761566155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839734973.

The product of its digits is 378000, while the sum is 46.

The spelling of 121761566155 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred sixty-six thousand, one hundred fifty-five".