18531063319 has 2 divisors, whose sum is σ = 18531063320. Its totient is φ = 18531063318.

The previous prime is 18531063311. The next prime is 18531063373. The reversal of 18531063319 is 91336013581.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91336013581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18531063319 - 2³ = 18531063311 is a prime.

It is a super-2 number, since 2×18531063319² (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 (18531063311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265531659 + 9265531660.

It is an arithmetic number, because the mean of its divisors is an integer number (9265531660).

Almost surely, 2^18531063319 is an apocalyptic number.

18531063319 is a deficient number, since it is larger than the sum of its proper divisors (1).

18531063319 is an equidigital number, since it uses as much as digits as its factorization.

18531063319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 18531063319 in words is "eighteen billion, five hundred thirty-one million, sixty-three thousand, three hundred nineteen".