16139646856 has 8 divisors (see below), whose sum is σ = 30261837870. Its totient is φ = 8069823424.

The previous prime is 16139646851. The next prime is 16139646857. The reversal of 16139646856 is 65864693161.

It can be written as a sum of positive squares in only one way, i.e., 10147338756 + 5992308100 = 100734^2 + 77410^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 16139646797 and 16139646806.

It is not an unprimeable number, because it can be changed into a prime (16139646851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1008727921 + ... + 1008727936.

Almost surely, 2^16139646856 is an apocalyptic number.

It is an amenable number.

16139646856 is a deficient number, since it is larger than the sum of its proper divisors (14122191014).

16139646856 is a wasteful number, since it uses less digits than its factorization.

16139646856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017455863 (or 2017455859 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 55.

It can be divided in two parts, 1613 and 9646856, that added together give a palindrome (9648469).

The spelling of 16139646856 in words is "sixteen billion, one hundred thirty-nine million, six hundred forty-six thousand, eight hundred fifty-six".