399882958661 has 2 divisors, whose sum is σ = 399882958662. Its totient is φ = 399882958660.

The previous prime is 399882958621. The next prime is 399882958663. The reversal of 399882958661 is 166859288993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291134705761 + 108748252900 = 539569^2 + 329770^2 .

It is a cyclic number.

It is not a de Polignac number, because 399882958661 - 2¹⁰ = 399882957637 is a prime.

Together with 399882958663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399882958663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199941479330 + 199941479331.

It is an arithmetic number, because the mean of its divisors is an integer number (199941479331).

Almost surely, 2^399882958661 is an apocalyptic number.

It is an amenable number.

399882958661 is a deficient number, since it is larger than the sum of its proper divisors (1).

399882958661 is an equidigital number, since it uses as much as digits as its factorization.

399882958661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403107840, while the sum is 74.

The spelling of 399882958661 in words is "three hundred ninety-nine billion, eight hundred eighty-two million, nine hundred fifty-eight thousand, six hundred sixty-one".