996828661 has 4 divisors (see below), whose sum is σ = 998355852. Its totient is φ = 995301472.

The previous prime is 996828647. The next prime is 996828667. The reversal of 996828661 is 166828699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166828699 = 233 ⋅716003.

It can be written as a sum of positive squares in 2 ways, for example, as 130644900 + 866183761 = 11430^2 + 29431^2 .

It is a cyclic number.

It is not a de Polignac number, because 996828661 - 2¹⁵ = 996795893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996828667) 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, 762616 + ... + 763921.

It is an arithmetic number, because the mean of its divisors is an integer number (249588963).

Almost surely, 2^996828661 is an apocalyptic number.

It is an amenable number.

996828661 is a deficient number, since it is larger than the sum of its proper divisors (1527191).

996828661 is a wasteful number, since it uses less digits than its factorization.

996828661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527190.

The product of its digits is 2239488, while the sum is 55.

The square root of 996828661 is about 31572.5935108283. The cubic root of 996828661 is about 998.9417675391.

The spelling of 996828661 in words is "nine hundred ninety-six million, eight hundred twenty-eight thousand, six hundred sixty-one".