18037021543 has 2 divisors, whose sum is σ = 18037021544. Its totient is φ = 18037021542.

The previous prime is 18037021523. The next prime is 18037021601. The reversal of 18037021543 is 34512073081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18037021543 - 2²⁹ = 17500150631 is a prime.

It is a super-2 number, since 2×18037021543² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18037021499 and 18037021508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18037021523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9018510771 + 9018510772.

It is an arithmetic number, because the mean of its divisors is an integer number (9018510772).

Almost surely, 2^18037021543 is an apocalyptic number.

18037021543 is a deficient number, since it is larger than the sum of its proper divisors (1).

18037021543 is an equidigital number, since it uses as much as digits as its factorization.

18037021543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 18037021543 in words is "eighteen billion, thirty-seven million, twenty-one thousand, five hundred forty-three".