22195871068661 has 2 divisors, whose sum is σ = 22195871068662. Its totient is φ = 22195871068660.

The previous prime is 22195871068643. The next prime is 22195871068667. The reversal of 22195871068661 is 16686017859122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15102006376900 + 7093864691761 = 3886130^2 + 2663431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22195871068661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22195871068594 and 22195871068603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22195871068667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11097935534330 + 11097935534331.

It is an arithmetic number, because the mean of its divisors is an integer number (11097935534331).

Almost surely, 2^{22195871068661} is an apocalyptic number.

It is an amenable number.

22195871068661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22195871068661 is an equidigital number, since it uses as much as digits as its factorization.

22195871068661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 22195871068661 in words is "twenty-two trillion, one hundred ninety-five billion, eight hundred seventy-one million, sixty-eight thousand, six hundred sixty-one".