281440664447 has 4 divisors (see below), whose sum is σ = 281442711696. Its totient is φ = 281438617200.

The previous prime is 281440664399. The next prime is 281440664497. The reversal of 281440664447 is 744466044182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281440664447 - 2²⁴ = 281423887231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281440664395 and 281440664404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281440664497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801323 + ... + 1097724.

It is an arithmetic number, because the mean of its divisors is an integer number (70360677924).

Almost surely, 2^281440664447 is an apocalyptic number.

281440664447 is a deficient number, since it is larger than the sum of its proper divisors (2047249).

281440664447 is a wasteful number, since it uses less digits than its factorization.

281440664447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047248.

The product of its (nonzero) digits is 4128768, while the sum is 50.

The spelling of 281440664447 in words is "two hundred eighty-one billion, four hundred forty million, six hundred sixty-four thousand, four hundred forty-seven".