16991264553984 has 176 divisors, whose sum is σ = 57508463852800. Its totient is φ = 4854646960128.

The previous prime is 16991264553931. The next prime is 16991264554001. The reversal of 16991264553984 is 48935546219961.

16991264553984 is a `hidden beast` number, since 1 + 6 + 9 + 9 + 1 + 2 + 6 + 4 + 5 + 539 + 84 = 666.

It is a super-2 number, since 2×16991264553984² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43703374 + ... + 44090445.

Almost surely, 2^{16991264553984} is an apocalyptic number.

16991264553984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16991264553984 is an abundant number, since it is smaller than the sum of its proper divisors (40517199298816).

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

16991264553984 is an equidigital number, since it uses as much as digits as its factorization.

16991264553984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87793855 (or 87793831 counting only the distinct ones).

The product of its digits is 503884800, while the sum is 72.

The spelling of 16991264553984 in words is "sixteen trillion, nine hundred ninety-one billion, two hundred sixty-four million, five hundred fifty-three thousand, nine hundred eighty-four".