122666647 has 2 divisors, whose sum is σ = 122666648. Its totient is φ = 122666646.

The previous prime is 122666639. The next prime is 122666651. The reversal of 122666647 is 746666221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122666647 - 2³ = 122666639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122666617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61333323 + 61333324.

It is an arithmetic number, because the mean of its divisors is an integer number (61333324).

Almost surely, 2^122666647 is an apocalyptic number.

122666647 is a deficient number, since it is larger than the sum of its proper divisors (1).

122666647 is an equidigital number, since it uses as much as digits as its factorization.

122666647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 122666647 is about 11075.4975960451. The cubic root of 122666647 is about 496.8693010277.

The spelling of 122666647 in words is "one hundred twenty-two million, six hundred sixty-six thousand, six hundred forty-seven".