400843519697 has 2 divisors, whose sum is σ = 400843519698. Its totient is φ = 400843519696.

The previous prime is 400843519667. The next prime is 400843519723. The reversal of 400843519697 is 796915348004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336627398416 + 64216121281 = 580196^2 + 253409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400843519697 is a prime.

It is not a weakly prime, because it can be changed into another prime (400843519667) 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, 200421759848 + 200421759849.

It is an arithmetic number, because the mean of its divisors is an integer number (200421759849).

Almost surely, 2^400843519697 is an apocalyptic number.

It is an amenable number.

400843519697 is a deficient number, since it is larger than the sum of its proper divisors (1).

400843519697 is an equidigital number, since it uses as much as digits as its factorization.

400843519697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 400843519697 in words is "four hundred billion, eight hundred forty-three million, five hundred nineteen thousand, six hundred ninety-seven".