15818664016 has 80 divisors (see below), whose sum is σ = 34261824960. Its totient is φ = 7031162880.

The previous prime is 15818664011. The next prime is 15818664031. The reversal of 15818664016 is 61046681851.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15818664011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1788886 + ... + 1797706.

It is an arithmetic number, because the mean of its divisors is an integer number (428272812).

Almost surely, 2^15818664016 is an apocalyptic number.

15818664016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15818664016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17130912480).

15818664016 is an abundant number, since it is smaller than the sum of its proper divisors (18443160944).

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

15818664016 is a wasteful number, since it uses less digits than its factorization.

15818664016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212 (or 9206 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 15818664016 in words is "fifteen billion, eight hundred eighteen million, six hundred sixty-four thousand, sixteen".