122663666591 has 2 divisors, whose sum is σ = 122663666592. Its totient is φ = 122663666590.

The previous prime is 122663666537. The next prime is 122663666687. The reversal of 122663666591 is 195666366221.

It is a weak prime.

It is an emirp because it is prime and its reverse (195666366221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122663666591 - 2¹⁸ = 122663404447 is a prime.

It is a super-2 number, since 2×122663666591² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122663660591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61331833295 + 61331833296.

It is an arithmetic number, because the mean of its divisors is an integer number (61331833296).

Almost surely, 2^122663666591 is an apocalyptic number.

122663666591 is a deficient number, since it is larger than the sum of its proper divisors (1).

122663666591 is an equidigital number, since it uses as much as digits as its factorization.

122663666591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4199040, while the sum is 53.

The spelling of 122663666591 in words is "one hundred twenty-two billion, six hundred sixty-three million, six hundred sixty-six thousand, five hundred ninety-one".