16781081440 has 24 divisors (see below), whose sum is σ = 39645305280. Its totient is φ = 6712432512.

The previous prime is 16781081419. The next prime is 16781081477. The reversal of 16781081440 is 4418018761.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 16781081393 and 16781081402.

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 3 ways as a sum of consecutive naturals, for example, 52440720 + ... + 52441039.

It is an arithmetic number, because the mean of its divisors is an integer number (1651887720).

Almost surely, 2^16781081440 is an apocalyptic number.

16781081440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16781081440 is an abundant number, since it is smaller than the sum of its proper divisors (22864223840).

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

16781081440 is a wasteful number, since it uses less digits than its factorization.

16781081440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104881774 (or 104881766 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 16781081440 in words is "sixteen billion, seven hundred eighty-one million, eighty-one thousand, four hundred forty".