121988650474861 has 2 divisors, whose sum is σ = 121988650474862. Its totient is φ = 121988650474860.

The previous prime is 121988650474759. The next prime is 121988650474877. The reversal of 121988650474861 is 168474056889121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71497763253225 + 50490887221636 = 8455635^2 + 7105694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121988650474861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121988650174861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60994325237430 + 60994325237431.

It is an arithmetic number, because the mean of its divisors is an integer number (60994325237431).

Almost surely, 2^{121988650474861} is an apocalyptic number.

It is an amenable number.

121988650474861 is a deficient number, since it is larger than the sum of its proper divisors (1).

121988650474861 is an equidigital number, since it uses as much as digits as its factorization.

121988650474861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185794560, while the sum is 70.

The spelling of 121988650474861 in words is "one hundred twenty-one trillion, nine hundred eighty-eight billion, six hundred fifty million, four hundred seventy-four thousand, eight hundred sixty-one".