408044998661 has 2 divisors, whose sum is σ = 408044998662. Its totient is φ = 408044998660.

The previous prime is 408044998619. The next prime is 408044998717. The reversal of 408044998661 is 166899440804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271747434436 + 136297564225 = 521294^2 + 369185^2 .

It is a cyclic number.

It is not a de Polignac number, because 408044998661 - 2¹⁰ = 408044997637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 408044998661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408044992661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204022499330 + 204022499331.

It is an arithmetic number, because the mean of its divisors is an integer number (204022499331).

Almost surely, 2^408044998661 is an apocalyptic number.

It is an amenable number.

408044998661 is a deficient number, since it is larger than the sum of its proper divisors (1).

408044998661 is an equidigital number, since it uses as much as digits as its factorization.

408044998661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 408044998661 in words is "four hundred eight billion, forty-four million, nine hundred ninety-eight thousand, six hundred sixty-one".