996782354881 has 4 divisors (see below), whose sum is σ = 996784660564. Its totient is φ = 996780049200.

The previous prime is 996782354861. The next prime is 996782354891. The reversal of 996782354881 is 188453287699.

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

It can be written as a sum of positive squares in 2 ways, for example, as 701950730625 + 294831624256 = 837825^2 + 542984^2 .

It is a 3-Lehmer number, since φ(996782354881) divides (996782354881-1)³.

It is a cyclic number.

It is not a de Polignac number, because 996782354881 - 2⁵ = 996782354849 is a prime.

It is a super-2 number, since 2×996782354881² (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 996782354881.

It is not an unprimeable number, because it can be changed into a prime (996782354861) by changing a digit.

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, 288210 + ... + 1441051.

It is an arithmetic number, because the mean of its divisors is an integer number (249196165141).

It is a Poulet number, since it divides 2^996782354880-1.

Almost surely, 2^996782354881 is an apocalyptic number.

996782354881 is the 576421-st octagonal number.

It is an amenable number.

996782354881 is a deficient number, since it is larger than the sum of its proper divisors (2305683).

996782354881 is a wasteful number, since it uses less digits than its factorization.

996782354881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305682.

The product of its digits is 209018880, while the sum is 70.

The spelling of 996782354881 in words is "nine hundred ninety-six billion, seven hundred eighty-two million, three hundred fifty-four thousand, eight hundred eighty-one".