138158899394 has 16 divisors (see below), whose sum is σ = 219450562200. Its totient is φ = 65009516544.

The previous prime is 138158899357. The next prime is 138158899441. The reversal of 138158899394 is 493998851831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 88747389025 + 49411510369 = 297905^2 + 222287^2 .

It is a super-2 number, since 2×138158899394² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156602 + ... + 548490.

Almost surely, 2^138158899394 is an apocalyptic number.

138158899394 is a deficient number, since it is larger than the sum of its proper divisors (81291662806).

138158899394 is a wasteful number, since it uses less digits than its factorization.

138158899394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402277.

The product of its digits is 67184640, while the sum is 68.

The spelling of 138158899394 in words is "one hundred thirty-eight billion, one hundred fifty-eight million, eight hundred ninety-nine thousand, three hundred ninety-four".