138401046568 has 8 divisors (see below), whose sum is σ = 259501962330. Its totient is φ = 69200523280.

The previous prime is 138401046557. The next prime is 138401046569. The reversal of 138401046568 is 865640104831.

It can be written as a sum of positive squares in only one way, i.e., 135396033444 + 3005013124 = 367962^2 + 54818^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×138401046568² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138401046569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8650065403 + ... + 8650065418.

Almost surely, 2^138401046568 is an apocalyptic number.

It is an amenable number.

138401046568 is a deficient number, since it is larger than the sum of its proper divisors (121100915762).

138401046568 is a wasteful number, since it uses less digits than its factorization.

138401046568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17300130827 (or 17300130823 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 138401046568 in words is "one hundred thirty-eight billion, four hundred one million, forty-six thousand, five hundred sixty-eight".