121556622673961 has 2 divisors, whose sum is σ = 121556622673962. Its totient is φ = 121556622673960.

The previous prime is 121556622673883. The next prime is 121556622673999. The reversal of 121556622673961 is 169376226655121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110028771091600 + 11527851582361 = 10489460^2 + 3395269^2 .

It is a cyclic number.

It is not a de Polignac number, because 121556622673961 - 2³⁰ = 121555548932137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121556622673894 and 121556622673903.

It is not a weakly prime, because it can be changed into another prime (121556622073961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778311336980 + 60778311336981.

It is an arithmetic number, because the mean of its divisors is an integer number (60778311336981).

Almost surely, 2^{121556622673961} is an apocalyptic number.

It is an amenable number.

121556622673961 is a deficient number, since it is larger than the sum of its proper divisors (1).

121556622673961 is an equidigital number, since it uses as much as digits as its factorization.

121556622673961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48988800, while the sum is 62.

The spelling of 121556622673961 in words is "one hundred twenty-one trillion, five hundred fifty-six billion, six hundred twenty-two million, six hundred seventy-three thousand, nine hundred sixty-one".