121556622673999 has 2 divisors, whose sum is σ = 121556622674000. Its totient is φ = 121556622673998.

The previous prime is 121556622673961. The next prime is 121556622674033. The reversal of 121556622673999 is 999376226655121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121556622673999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121556622613999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778311336999 + 60778311337000.

It is an arithmetic number, because the mean of its divisors is an integer number (60778311337000).

Almost surely, 2^{121556622673999} is an apocalyptic number.

121556622673999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121556622673999 is an equidigital number, since it uses as much as digits as its factorization.

121556622673999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 661348800, while the sum is 73.

The spelling of 121556622673999 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 ninety-nine".