138551785867 has 16 divisors (see below), whose sum is σ = 163058031072. Its totient is φ = 116310238720.

The previous prime is 138551785861. The next prime is 138551785873. The reversal of 138551785867 is 768587155831.

It is an interprime number because it is at equal distance from previous prime (138551785861) and next prime (138551785873).

It is a cyclic number.

It is not a de Polignac number, because 138551785867 - 2³ = 138551785859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138551785799 and 138551785808.

It is not an unprimeable number, because it can be changed into a prime (138551785861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6979888 + ... + 6999709.

It is an arithmetic number, because the mean of its divisors is an integer number (10191126942).

Almost surely, 2^138551785867 is an apocalyptic number.

138551785867 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138551785867 is a deficient number, since it is larger than the sum of its proper divisors (24506245205).

138551785867 is a wasteful number, since it uses less digits than its factorization.

138551785867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13979678.

The product of its digits is 56448000, while the sum is 64.

The spelling of 138551785867 in words is "one hundred thirty-eight billion, five hundred fifty-one million, seven hundred eighty-five thousand, eight hundred sixty-seven".