121565066069 has 2 divisors, whose sum is σ = 121565066070. Its totient is φ = 121565066068.

The previous prime is 121565066027. The next prime is 121565066083. The reversal of 121565066069 is 960660565121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120088585444 + 1476480625 = 346538^2 + 38425^2 .

It is an emirp because it is prime and its reverse (960660565121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121565066069 - 2¹² = 121565061973 is a prime.

It is a super-2 number, since 2×121565066069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121565066089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60782533034 + 60782533035.

It is an arithmetic number, because the mean of its divisors is an integer number (60782533035).

Almost surely, 2^121565066069 is an apocalyptic number.

It is an amenable number.

121565066069 is a deficient number, since it is larger than the sum of its proper divisors (1).

121565066069 is an equidigital number, since it uses as much as digits as its factorization.

121565066069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 121565066069 in words is "one hundred twenty-one billion, five hundred sixty-five million, sixty-six thousand, sixty-nine".