15889779516 has 72 divisors (see below), whose sum is σ = 40176259200. Its totient is φ = 4885667904.

The previous prime is 15889779443. The next prime is 15889779571. The reversal of 15889779516 is 61597798851.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5472121 + ... + 5475023.

It is an arithmetic number, because the mean of its divisors is an integer number (558003600).

Almost surely, 2^15889779516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15889779516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20088129600).

15889779516 is an abundant number, since it is smaller than the sum of its proper divisors (24286479684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15889779516 is a wasteful number, since it uses less digits than its factorization.

15889779516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635 (or 5620 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 66.

The spelling of 15889779516 in words is "fifteen billion, eight hundred eighty-nine million, seven hundred seventy-nine thousand, five hundred sixteen".