16991271360 has 504 divisors, whose sum is σ = 71574019920. Its totient is φ = 3678732288.

The previous prime is 16991271347. The next prime is 16991271389. The reversal of 16991271360 is 6317219961.

16991271360 is a `hidden beast` number, since 16 + 9 + 9 + 1 + 271 + 360 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2678112 + ... + 2684448.

Almost surely, 2^16991271360 is an apocalyptic number.

16991271360 is a gapful number since it is divisible by the number (10) 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 16991271360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35787009960).

16991271360 is an abundant number, since it is smaller than the sum of its proper divisors (54582748560).

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

16991271360 is a wasteful number, since it uses less digits than its factorization.

16991271360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393 (or 6373 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 16991271360 in words is "sixteen billion, nine hundred ninety-one million, two hundred seventy-one thousand, three hundred sixty".