16549638336 has 448 divisors, whose sum is σ = 62764416000. Its totient is φ = 4149411840.

The previous prime is 16549638317. The next prime is 16549638349. The reversal of 16549638336 is 63383694561.

16549638336 is a `hidden beast` number, since 1 + 6 + 549 + 63 + 8 + 3 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3856480 + ... + 3860768.

Almost surely, 2^16549638336 is an apocalyptic number.

16549638336 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 16549638336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31382208000).

16549638336 is an abundant number, since it is smaller than the sum of its proper divisors (46214777664).

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

16549638336 is a wasteful number, since it uses less digits than its factorization.

16549638336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357 (or 4341 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 54.

The spelling of 16549638336 in words is "sixteen billion, five hundred forty-nine million, six hundred thirty-eight thousand, three hundred thirty-six".