122666639 has 2 divisors, whose sum is σ = 122666640. Its totient is φ = 122666638.

The previous prime is 122666627. The next prime is 122666647. The reversal of 122666639 is 936666221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122666639 - 2⁴ = 122666623 is a prime.

It is a super-3 number, since 3×122666639³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 122666596 and 122666605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122666689) 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, 61333319 + 61333320.

It is an arithmetic number, because the mean of its divisors is an integer number (61333320).

Almost surely, 2^122666639 is an apocalyptic number.

122666639 is a deficient number, since it is larger than the sum of its proper divisors (1).

122666639 is an equidigital number, since it uses as much as digits as its factorization.

122666639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 41.

The square root of 122666639 is about 11075.4972348875. The cubic root of 122666639 is about 496.8692902262.

The spelling of 122666639 in words is "one hundred twenty-two million, six hundred sixty-six thousand, six hundred thirty-nine".