18367532449 has 6 divisors (see below), whose sum is σ = 21366313314. Its totient is φ = 15743599200.

The previous prime is 18367532387. The next prime is 18367532453. The reversal of 18367532449 is 94423576381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11026470049 + 7341062400 = 105007^2 + 85680^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18367532449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18367532396 and 18367532405.

It is not an unprimeable number, because it can be changed into a prime (18367532749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 187423752 + ... + 187423849.

It is an arithmetic number, because the mean of its divisors is an integer number (3561052219).

Almost surely, 2^18367532449 is an apocalyptic number.

It is an amenable number.

18367532449 is a deficient number, since it is larger than the sum of its proper divisors (2998780865).

18367532449 is an equidigital number, since it uses as much as digits as its factorization.

18367532449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374847615 (or 374847608 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 18367532449 in words is "eighteen billion, three hundred sixty-seven million, five hundred thirty-two thousand, four hundred forty-nine".