121752055661 has 2 divisors, whose sum is σ = 121752055662. Its totient is φ = 121752055660.

The previous prime is 121752055603. The next prime is 121752055709. The reversal of 121752055661 is 166550257121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112614607561 + 9137448100 = 335581^2 + 95590^2 .

It is a cyclic number.

It is not a de Polignac number, because 121752055661 - 2³⁰ = 120678313837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121752055861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60876027830 + 60876027831.

It is an arithmetic number, because the mean of its divisors is an integer number (60876027831).

Almost surely, 2^121752055661 is an apocalyptic number.

It is an amenable number.

121752055661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121752055661 is an equidigital number, since it uses as much as digits as its factorization.

121752055661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 121752055661 in words is "one hundred twenty-one billion, seven hundred fifty-two million, fifty-five thousand, six hundred sixty-one".