138006968868 has 18 divisors (see below), whose sum is σ = 348850949174. Its totient is φ = 46002322944.

The previous prime is 138006968861. The next prime is 138006968941. The reversal of 138006968868 is 868869600831.

It can be written as a sum of positive squares in only one way, i.e., 73966593024 + 64040375844 = 271968^2 + 253062^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×138006968868² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138006968861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1916763421 + ... + 1916763492.

Almost surely, 2^138006968868 is an apocalyptic number.

138006968868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138006968868 is an abundant number, since it is smaller than the sum of its proper divisors (210843980306).

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

138006968868 is a wasteful number, since it uses less digits than its factorization.

138006968868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833526923 (or 3833526918 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 63.

The spelling of 138006968868 in words is "one hundred thirty-eight billion, six million, nine hundred sixty-eight thousand, eight hundred sixty-eight".