138775138905 has 128 divisors (see below), whose sum is σ = 257344045056. Its totient is φ = 63254016000.

The previous prime is 138775138903. The next prime is 138775138907. The reversal of 138775138905 is 509831577831.

It is an interprime number because it is at equal distance from previous prime (138775138903) and next prime (138775138907).

It is not a de Polignac number, because 138775138905 - 2¹ = 138775138903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138775138903) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 53559160 + ... + 53561750.

It is an arithmetic number, because the mean of its divisors is an integer number (2010500352).

Almost surely, 2^138775138905 is an apocalyptic number.

138775138905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138775138905 is a deficient number, since it is larger than the sum of its proper divisors (118568906151).

138775138905 is a wasteful number, since it uses less digits than its factorization.

138775138905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its (nonzero) digits is 6350400, while the sum is 57.

The spelling of 138775138905 in words is "one hundred thirty-eight billion, seven hundred seventy-five million, one hundred thirty-eight thousand, nine hundred five".