18016436349 has 6 divisors (see below), whose sum is σ = 26023741406. Its totient is φ = 12010957560.

The previous prime is 18016436303. The next prime is 18016436353. The reversal of 18016436349 is 94363461081.

18016436349 is a `hidden beast` number, since 1 + 8 + 0 + 1 + 6 + 4 + 3 + 634 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15579533124 + 2436903225 = 124818^2 + 49365^2 .

It is not a de Polignac number, because 18016436349 - 2²⁰ = 18015387773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18016436149) 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, 1000913122 + ... + 1000913139.

Almost surely, 2^18016436349 is an apocalyptic number.

It is an amenable number.

18016436349 is a deficient number, since it is larger than the sum of its proper divisors (8007305057).

18016436349 is a wasteful number, since it uses less digits than its factorization.

18016436349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001826267 (or 2001826264 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 18016436349 in words is "eighteen billion, sixteen million, four hundred thirty-six thousand, three hundred forty-nine".