16691277312 has 280 divisors, whose sum is σ = 50477267016. Its totient is φ = 5511131136.

The previous prime is 16691277299. The next prime is 16691277329. The reversal of 16691277312 is 21377219661.

16691277312 is a `hidden beast` number, since 1 + 6 + 69 + 1 + 277 + 312 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 73529743 + ... + 73529969.

Almost surely, 2^16691277312 is an apocalyptic number.

16691277312 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 16691277312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25238633508).

16691277312 is an abundant number, since it is smaller than the sum of its proper divisors (33785989704).

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

16691277312 is an frugal number, since it uses more digits than its factorization.

16691277312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 429 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The spelling of 16691277312 in words is "sixteen billion, six hundred ninety-one million, two hundred seventy-seven thousand, three hundred twelve".