198011976745669 has 2 divisors, whose sum is σ = 198011976745670. Its totient is φ = 198011976745668.

The previous prime is 198011976745651. The next prime is 198011976745717. The reversal of 198011976745669 is 966547679110891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125711477924769 + 72300498820900 = 11212113^2 + 8502970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198011976745669 is a prime.

It is a super-2 number, since 2×198011976745669² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198011976745469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99005988372834 + 99005988372835.

It is an arithmetic number, because the mean of its divisors is an integer number (99005988372835).

Almost surely, 2^{198011976745669} is an apocalyptic number.

It is an amenable number.

198011976745669 is a deficient number, since it is larger than the sum of its proper divisors (1).

198011976745669 is an equidigital number, since it uses as much as digits as its factorization.

198011976745669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234517760, while the sum is 79.

The spelling of 198011976745669 in words is "one hundred ninety-eight trillion, eleven billion, nine hundred seventy-six million, seven hundred forty-five thousand, six hundred sixty-nine".