216436968533 has 2 divisors, whose sum is σ = 216436968534. Its totient is φ = 216436968532.

The previous prime is 216436968509. The next prime is 216436968541. The reversal of 216436968533 is 335869634612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215154039409 + 1282929124 = 463847^2 + 35818^2 .

It is a cyclic number.

It is not a de Polignac number, because 216436968533 - 2¹² = 216436964437 is a prime.

It is a super-2 number, since 2×216436968533² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216436968593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108218484266 + 108218484267.

It is an arithmetic number, because the mean of its divisors is an integer number (108218484267).

Almost surely, 2^216436968533 is an apocalyptic number.

It is an amenable number.

216436968533 is a deficient number, since it is larger than the sum of its proper divisors (1).

216436968533 is an equidigital number, since it uses as much as digits as its factorization.

216436968533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16796160, while the sum is 56.

The spelling of 216436968533 in words is "two hundred sixteen billion, four hundred thirty-six million, nine hundred sixty-eight thousand, five hundred thirty-three".