13318991533 has 2 divisors, whose sum is σ = 13318991534. Its totient is φ = 13318991532.

The previous prime is 13318991519. The next prime is 13318991549. The reversal of 13318991533 is 33519981331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8554955049 + 4764036484 = 92493^2 + 69022^2 .

It is an emirp because it is prime and its reverse (33519981331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13318991533 - 2¹³ = 13318983341 is a prime.

It is a super-2 number, since 2×13318991533² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13318991563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6659495766 + 6659495767.

It is an arithmetic number, because the mean of its divisors is an integer number (6659495767).

Almost surely, 2^13318991533 is an apocalyptic number.

It is an amenable number.

13318991533 is a deficient number, since it is larger than the sum of its proper divisors (1).

13318991533 is an equidigital number, since it uses as much as digits as its factorization.

13318991533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 46.

The spelling of 13318991533 in words is "thirteen billion, three hundred eighteen million, nine hundred ninety-one thousand, five hundred thirty-three".