138157231136 has 12 divisors (see below), whose sum is σ = 271997048862. Its totient is φ = 69078615552.

The previous prime is 138157231117. The next prime is 138157231139. The reversal of 138157231136 is 631132751831.

It can be written as a sum of positive squares in only one way, i.e., 74977392400 + 63179838736 = 273820^2 + 251356^2 .

It is a super-2 number, since 2×138157231136² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138157231093 and 138157231102.

It is not an unprimeable number, because it can be changed into a prime (138157231139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2158706705 + ... + 2158706768.

Almost surely, 2^138157231136 is an apocalyptic number.

138157231136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138157231136 is a deficient number, since it is larger than the sum of its proper divisors (133839817726).

138157231136 is an equidigital number, since it uses as much as digits as its factorization.

138157231136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317413483 (or 4317413475 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

Adding to 138157231136 its reverse (631132751831), we get a palindrome (769289982967).

The spelling of 138157231136 in words is "one hundred thirty-eight billion, one hundred fifty-seven million, two hundred thirty-one thousand, one hundred thirty-six".