138766555 has 4 divisors (see below), whose sum is σ = 166519872. Its totient is φ = 111013240.

The previous prime is 138766553. The next prime is 138766559. The reversal of 138766555 is 555667831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138766555 - 2¹ = 138766553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138766553) 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 in 3 ways as a sum of consecutive naturals, for example, 13876651 + ... + 13876660.

It is an arithmetic number, because the mean of its divisors is an integer number (41629968).

Almost surely, 2^138766555 is an apocalyptic number.

138766555 is a deficient number, since it is larger than the sum of its proper divisors (27753317).

138766555 is an equidigital number, since it uses as much as digits as its factorization.

138766555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27753316.

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

The square root of 138766555 is about 11779.9216890436. The cubic root of 138766555 is about 517.7199917279.

The spelling of 138766555 in words is "one hundred thirty-eight million, seven hundred sixty-six thousand, five hundred fifty-five".