18344501849 has 2 divisors, whose sum is σ = 18344501850. Its totient is φ = 18344501848.

The previous prime is 18344501809. The next prime is 18344501863. The reversal of 18344501849 is 94810544381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13096513600 + 5247988249 = 114440^2 + 72443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18344501849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18344501809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9172250924 + 9172250925.

It is an arithmetic number, because the mean of its divisors is an integer number (9172250925).

Almost surely, 2^18344501849 is an apocalyptic number.

It is an amenable number.

18344501849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18344501849 is an equidigital number, since it uses as much as digits as its factorization.

18344501849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 18344501849 in words is "eighteen billion, three hundred forty-four million, five hundred one thousand, eight hundred forty-nine".