399969250543 has 2 divisors, whose sum is σ = 399969250544. Its totient is φ = 399969250542.

The previous prime is 399969250531. The next prime is 399969250579. The reversal of 399969250543 is 345052969993.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399969250543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399969250523) 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 as a sum of consecutive naturals, namely, 199984625271 + 199984625272.

It is an arithmetic number, because the mean of its divisors is an integer number (199984625272).

Almost surely, 2^399969250543 is an apocalyptic number.

399969250543 is a deficient number, since it is larger than the sum of its proper divisors (1).

399969250543 is an equidigital number, since it uses as much as digits as its factorization.

399969250543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70858800, while the sum is 64.

The spelling of 399969250543 in words is "three hundred ninety-nine billion, nine hundred sixty-nine million, two hundred fifty thousand, five hundred forty-three".