18775712533 has 2 divisors, whose sum is σ = 18775712534. Its totient is φ = 18775712532.

The previous prime is 18775712503. The next prime is 18775712537. The reversal of 18775712533 is 33521757781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10334145649 + 8441566884 = 101657^2 + 91878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18775712533 is a prime.

It is a super-2 number, since 2×18775712533² (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 (18775712537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9387856266 + 9387856267.

It is an arithmetic number, because the mean of its divisors is an integer number (9387856267).

Almost surely, 2^18775712533 is an apocalyptic number.

It is an amenable number.

18775712533 is a deficient number, since it is larger than the sum of its proper divisors (1).

18775712533 is an equidigital number, since it uses as much as digits as its factorization.

18775712533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234800, while the sum is 49.

The spelling of 18775712533 in words is "eighteen billion, seven hundred seventy-five million, seven hundred twelve thousand, five hundred thirty-three".