266196222691657 has 2 divisors, whose sum is σ = 266196222691658. Its totient is φ = 266196222691656.

The previous prime is 266196222691639. The next prime is 266196222691673. The reversal of 266196222691657 is 756196222691662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219514478272441 + 46681744419216 = 14816021^2 + 6832404^2 .

It is a cyclic number.

It is not a de Polignac number, because 266196222691657 - 2²⁷ = 266196088473929 is a prime.

It is not a weakly prime, because it can be changed into another prime (266196222691057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133098111345828 + 133098111345829.

It is an arithmetic number, because the mean of its divisors is an integer number (133098111345829).

Almost surely, 2^{266196222691657} is an apocalyptic number.

It is an amenable number.

266196222691657 is a deficient number, since it is larger than the sum of its proper divisors (1).

266196222691657 is an equidigital number, since it uses as much as digits as its factorization.

266196222691657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352719360, while the sum is 70.

The spelling of 266196222691657 in words is "two hundred sixty-six trillion, one hundred ninety-six billion, two hundred twenty-two million, six hundred ninety-one thousand, six hundred fifty-seven".