15978118123 has 6 divisors (see below), whose sum is σ = 17562725012. Its totient is φ = 14525561820.

The previous prime is 15978118111. The next prime is 15978118129. The reversal of 15978118123 is 32181187951.

It is not a de Polignac number, because 15978118123 - 2⁹ = 15978117611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15978118129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66025161 + ... + 66025402.

Almost surely, 2^15978118123 is an apocalyptic number.

15978118123 is a deficient number, since it is larger than the sum of its proper divisors (1584606889).

15978118123 is a wasteful number, since it uses less digits than its factorization.

15978118123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132050585 (or 132050574 counting only the distinct ones).

The product of its digits is 120960, while the sum is 46.

The spelling of 15978118123 in words is "fifteen billion, nine hundred seventy-eight million, one hundred eighteen thousand, one hundred twenty-three".