18416355949 has 4 divisors (see below), whose sum is σ = 18417460864. Its totient is φ = 18415251036.

The previous prime is 18416355941. The next prime is 18416355959. The reversal of 18416355949 is 94955361481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18416355949 - 2³ = 18416355941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18416355949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18416355941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527067 + ... + 560920.

It is an arithmetic number, because the mean of its divisors is an integer number (4604365216).

Almost surely, 2^18416355949 is an apocalyptic number.

It is an amenable number.

18416355949 is a deficient number, since it is larger than the sum of its proper divisors (1104915).

18416355949 is a wasteful number, since it uses less digits than its factorization.

18416355949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104914.

The product of its digits is 4665600, while the sum is 55.

The spelling of 18416355949 in words is "eighteen billion, four hundred sixteen million, three hundred fifty-five thousand, nine hundred forty-nine".