121761536569 has 2 divisors, whose sum is σ = 121761536570. Its totient is φ = 121761536568.

The previous prime is 121761536539. The next prime is 121761536597. The reversal of 121761536569 is 965635167121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74373471225 + 47388065344 = 272715^2 + 217688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121761536569 is a prime.

It is a super-2 number, since 2×121761536569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121761536539) 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 as a sum of consecutive naturals, namely, 60880768284 + 60880768285.

It is an arithmetic number, because the mean of its divisors is an integer number (60880768285).

Almost surely, 2^121761536569 is an apocalyptic number.

It is an amenable number.

121761536569 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761536569 is an equidigital number, since it uses as much as digits as its factorization.

121761536569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 52.

The spelling of 121761536569 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred thirty-six thousand, five hundred sixty-nine".