15862742138 has 4 divisors (see below), whose sum is σ = 23794113210. Its totient is φ = 7931371068.

The previous prime is 15862742131. The next prime is 15862742149. The reversal of 15862742138 is 83124726851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83124726851 = 31957 ⋅2601143.

It can be written as a sum of positive squares in only one way, i.e., 15675791209 + 186950929 = 125203^2 + 13673^2 .

It is a super-2 number, since 2×15862742138² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15862742092 and 15862742101.

It is not an unprimeable number, because it can be changed into a prime (15862742131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3965685533 + ... + 3965685536.

Almost surely, 2^15862742138 is an apocalyptic number.

15862742138 is a deficient number, since it is larger than the sum of its proper divisors (7931371072).

15862742138 is an equidigital number, since it uses as much as digits as its factorization.

15862742138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7931371071.

The product of its digits is 645120, while the sum is 47.

The spelling of 15862742138 in words is "fifteen billion, eight hundred sixty-two million, seven hundred forty-two thousand, one hundred thirty-eight".