201622666897 has 2 divisors, whose sum is σ = 201622666898. Its totient is φ = 201622666896.

The previous prime is 201622666891. The next prime is 201622666913. The reversal of 201622666897 is 798666226102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198170986896 + 3451680001 = 445164^2 + 58751^2 .

It is a cyclic number.

It is not a de Polignac number, because 201622666897 - 2³¹ = 199475183249 is a prime.

It is not a weakly prime, because it can be changed into another prime (201622666891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100811333448 + 100811333449.

It is an arithmetic number, because the mean of its divisors is an integer number (100811333449).

Almost surely, 2^201622666897 is an apocalyptic number.

It is an amenable number.

201622666897 is a deficient number, since it is larger than the sum of its proper divisors (1).

201622666897 is an equidigital number, since it uses as much as digits as its factorization.

201622666897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 201622666897 in words is "two hundred one billion, six hundred twenty-two million, six hundred sixty-six thousand, eight hundred ninety-seven".