121761323647 has 2 divisors, whose sum is σ = 121761323648. Its totient is φ = 121761323646.

The previous prime is 121761323609. The next prime is 121761323659. The reversal of 121761323647 is 746323167121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121761323647 - 2¹⁹ = 121760799359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121761323147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60880661823 + 60880661824.

It is an arithmetic number, because the mean of its divisors is an integer number (60880661824).

Almost surely, 2^121761323647 is an apocalyptic number.

121761323647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761323647 is an equidigital number, since it uses as much as digits as its factorization.

121761323647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The spelling of 121761323647 in words is "one hundred twenty-one billion, seven hundred sixty-one million, three hundred twenty-three thousand, six hundred forty-seven".