15999996672 has 432 divisors, whose sum is σ = 53569152000. Its totient is φ = 4542013440.

The previous prime is 15999996659. The next prime is 15999996679. The reversal of 15999996672 is 27669999951.

It is a happy number.

It is a super-2 number, since 2×15999996672² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 15999996672.

It is not an unprimeable number, because it can be changed into a prime (15999996679) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71748753 + ... + 71748975.

Almost surely, 2^15999996672 is an apocalyptic number.

15999996672 is a gapful number since it is divisible by the number (12) 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 15999996672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784576000).

15999996672 is an abundant number, since it is smaller than the sum of its proper divisors (37569155328).

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

15999996672 is a wasteful number, since it uses less digits than its factorization.

15999996672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 407 counting only the distinct ones).

The product of its digits is 148803480, while the sum is 72.

The spelling of 15999996672 in words is "fifteen billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, six hundred seventy-two".