138856663998 has 24 divisors (see below), whose sum is σ = 323998883208. Its totient is φ = 42725127312.

The previous prime is 138856663991. The next prime is 138856664017. The reversal of 138856663998 is 899366658831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138856663991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296702040 + ... + 296702507.

It is an arithmetic number, because the mean of its divisors is an integer number (13499953467).

Almost surely, 2^138856663998 is an apocalyptic number.

138856663998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138856663998 is an abundant number, since it is smaller than the sum of its proper divisors (185142219210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138856663998 is a wasteful number, since it uses less digits than its factorization.

138856663998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593404568 (or 593404565 counting only the distinct ones).

The product of its digits is 403107840, while the sum is 72.

The spelling of 138856663998 in words is "one hundred thirty-eight billion, eight hundred fifty-six million, six hundred sixty-three thousand, nine hundred ninety-eight".