660121667 has 2 divisors, whose sum is σ = 660121668. Its totient is φ = 660121666.

The previous prime is 660121621. The next prime is 660121669. The reversal of 660121667 is 766121066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660121667 - 2⁶ = 660121603 is a prime.

Together with 660121669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660121669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330060833 + 330060834.

It is an arithmetic number, because the mean of its divisors is an integer number (330060834).

Almost surely, 2^660121667 is an apocalyptic number.

660121667 is a deficient number, since it is larger than the sum of its proper divisors (1).

660121667 is an equidigital number, since it uses as much as digits as its factorization.

660121667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 660121667 is about 25692.8329889874. The cubic root of 660121667 is about 870.7122660527.

The spelling of 660121667 in words is "six hundred sixty million, one hundred twenty-one thousand, six hundred sixty-seven".