18434778872 has 8 divisors (see below), whose sum is σ = 34565210400. Its totient is φ = 9217389432.

The previous prime is 18434778793. The next prime is 18434778913. The reversal of 18434778872 is 27887743481.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1152173672 + ... + 1152173687.

It is an arithmetic number, because the mean of its divisors is an integer number (4320651300).

Almost surely, 2^18434778872 is an apocalyptic number.

It is an amenable number.

18434778872 is a deficient number, since it is larger than the sum of its proper divisors (16130431528).

18434778872 is a wasteful number, since it uses less digits than its factorization.

18434778872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304347365 (or 2304347361 counting only the distinct ones).

The product of its digits is 16859136, while the sum is 59.

The spelling of 18434778872 in words is "eighteen billion, four hundred thirty-four million, seven hundred seventy-eight thousand, eight hundred seventy-two".