28823418661 has 2 divisors, whose sum is σ = 28823418662. Its totient is φ = 28823418660.

The previous prime is 28823418649. The next prime is 28823418671. The reversal of 28823418661 is 16681432882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28436076900 + 387341761 = 168630^2 + 19681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28823418661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28823418601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14411709330 + 14411709331.

It is an arithmetic number, because the mean of its divisors is an integer number (14411709331).

Almost surely, 2^28823418661 is an apocalyptic number.

It is an amenable number.

28823418661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28823418661 is an equidigital number, since it uses as much as digits as its factorization.

28823418661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 49.

The spelling of 28823418661 in words is "twenty-eight billion, eight hundred twenty-three million, four hundred eighteen thousand, six hundred sixty-one".