18351644479 has 16 divisors (see below), whose sum is σ = 21377405952. Its totient is φ = 15427140768.

The previous prime is 18351644431. The next prime is 18351644497. The reversal of 18351644479 is 97444615381.

It is a cyclic number.

It is not a de Polignac number, because 18351644479 - 2⁷ = 18351644351 is a prime.

It is a super-2 number, since 2×18351644479² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18351642479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1113352 + ... + 1129714.

It is an arithmetic number, because the mean of its divisors is an integer number (1336087872).

Almost surely, 2^18351644479 is an apocalyptic number.

18351644479 is a deficient number, since it is larger than the sum of its proper divisors (3025761473).

18351644479 is a wasteful number, since it uses less digits than its factorization.

18351644479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19446.

The product of its digits is 2903040, while the sum is 52.

The spelling of 18351644479 in words is "eighteen billion, three hundred fifty-one million, six hundred forty-four thousand, four hundred seventy-nine".