138888985965 has 16 divisors (see below), whose sum is σ = 226415253888. Its totient is φ = 72676500416.

The previous prime is 138888985943. The next prime is 138888985969. The reversal of 138888985965 is 569589888831.

It is a cyclic number.

It is not a de Polignac number, because 138888985965 - 2¹⁴ = 138888969581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138888985969) 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, 87350769 + ... + 87352358.

It is an arithmetic number, because the mean of its divisors is an integer number (14150953368).

Almost surely, 2^138888985965 is an apocalyptic number.

138888985965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138888985965 is a deficient number, since it is larger than the sum of its proper divisors (87526267923).

138888985965 is a wasteful number, since it uses less digits than its factorization.

138888985965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174703188.

The product of its digits is 1194393600, while the sum is 78.

The spelling of 138888985965 in words is "one hundred thirty-eight billion, eight hundred eighty-eight million, nine hundred eighty-five thousand, nine hundred sixty-five".