816056722281 has 8 divisors (see below), whose sum is σ = 1088105470240. Its totient is φ = 544022894592.

The previous prime is 816056722277. The next prime is 816056722303. The reversal of 816056722281 is 182227650618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816056722281 - 2² = 816056722277 is a prime.

It is a super-2 number, since 2×816056722281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816056722281.

It is not an unprimeable number, because it can be changed into a prime (816056722981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3601816 + ... + 3821673.

It is an arithmetic number, because the mean of its divisors is an integer number (136013183780).

Almost surely, 2^816056722281 is an apocalyptic number.

It is an amenable number.

816056722281 is a deficient number, since it is larger than the sum of its proper divisors (272048747959).

816056722281 is a wasteful number, since it uses less digits than its factorization.

816056722281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460135.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 816056722281 in words is "eight hundred sixteen billion, fifty-six million, seven hundred twenty-two thousand, two hundred eighty-one".