138555667 has 2 divisors, whose sum is σ = 138555668. Its totient is φ = 138555666.

The previous prime is 138555653. The next prime is 138555689. The reversal of 138555667 is 766555831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138555667 - 2⁷ = 138555539 is a prime.

It is not a weakly prime, because it can be changed into another prime (138555167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69277833 + 69277834.

It is an arithmetic number, because the mean of its divisors is an integer number (69277834).

Almost surely, 2^138555667 is an apocalyptic number.

138555667 is a deficient number, since it is larger than the sum of its proper divisors (1).

138555667 is an equidigital number, since it uses as much as digits as its factorization.

138555667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756000, while the sum is 46.

The square root of 138555667 is about 11770.9671225435. The cubic root of 138555667 is about 517.4575935130.

The spelling of 138555667 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, six hundred sixty-seven".