506211661643 has 2 divisors, whose sum is σ = 506211661644. Its totient is φ = 506211661642.

The previous prime is 506211661607. The next prime is 506211661717. The reversal of 506211661643 is 346166112605.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506211661643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 506211661643.

It is not a weakly prime, because it can be changed into another prime (506211661603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253105830821 + 253105830822.

It is an arithmetic number, because the mean of its divisors is an integer number (253105830822).

Almost surely, 2^506211661643 is an apocalyptic number.

506211661643 is a deficient number, since it is larger than the sum of its proper divisors (1).

506211661643 is an equidigital number, since it uses as much as digits as its factorization.

506211661643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 506211661643 in words is "five hundred six billion, two hundred eleven million, six hundred sixty-one thousand, six hundred forty-three".