505202216989 has 2 divisors, whose sum is σ = 505202216990. Its totient is φ = 505202216988.

The previous prime is 505202216971. The next prime is 505202217043. The reversal of 505202216989 is 989612202505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502456980964 + 2745236025 = 708842^2 + 52395^2 .

It is a cyclic number.

It is not a de Polignac number, because 505202216989 - 2⁵ = 505202216957 is a prime.

It is a super-2 number, since 2×505202216989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505202216969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252601108494 + 252601108495.

It is an arithmetic number, because the mean of its divisors is an integer number (252601108495).

Almost surely, 2^505202216989 is an apocalyptic number.

It is an amenable number.

505202216989 is a deficient number, since it is larger than the sum of its proper divisors (1).

505202216989 is an equidigital number, since it uses as much as digits as its factorization.

505202216989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 505202216989 in words is "five hundred five billion, two hundred two million, two hundred sixteen thousand, nine hundred eighty-nine".