18324531851 has 2 divisors, whose sum is σ = 18324531852. Its totient is φ = 18324531850.

The previous prime is 18324531809. The next prime is 18324531857. The reversal of 18324531851 is 15813542381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18324531851 - 2²² = 18320337547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18324531799 and 18324531808.

It is not a weakly prime, because it can be changed into another prime (18324531857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9162265925 + 9162265926.

It is an arithmetic number, because the mean of its divisors is an integer number (9162265926).

Almost surely, 2^18324531851 is an apocalyptic number.

18324531851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18324531851 is an equidigital number, since it uses as much as digits as its factorization.

18324531851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 41.

The spelling of 18324531851 in words is "eighteen billion, three hundred twenty-four million, five hundred thirty-one thousand, eight hundred fifty-one".