16781797643936 has 48 divisors (see below), whose sum is σ = 35733345082344. Its totient is φ = 7712202768384.

The previous prime is 16781797643903. The next prime is 16781797643993. The reversal of 16781797643936 is 63934679718761.

It can be written as a sum of positive squares in 4 ways, for example, as 3179302963600 + 13602494680336 = 1783060^2 + 3688156^2 .

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 7 ways as a sum of consecutive naturals, for example, 86471441 + ... + 86665296.

Almost surely, 2^{16781797643936} is an apocalyptic number.

16781797643936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16781797643936 is an abundant number, since it is smaller than the sum of its proper divisors (18951547438408).

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

16781797643936 is a wasteful number, since it uses less digits than its factorization.

16781797643936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173136993 (or 173136985 counting only the distinct ones).

The product of its digits is 1728324864, while the sum is 77.

The spelling of 16781797643936 in words is "sixteen trillion, seven hundred eighty-one billion, seven hundred ninety-seven million, six hundred forty-three thousand, nine hundred thirty-six".