18002791648 has 24 divisors (see below), whose sum is σ = 37527879312. Its totient is φ = 8471901696.

The previous prime is 18002791601. The next prime is 18002791649. The reversal of 18002791648 is 84619720081.

It is a junction number, because it is equal to n+sod(n) for n = 18002791598 and 18002791607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18002791649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16546140 + ... + 16547227.

It is an arithmetic number, because the mean of its divisors is an integer number (1563661638).

Almost surely, 2^18002791648 is an apocalyptic number.

It is an amenable number.

18002791648 is an abundant number, since it is smaller than the sum of its proper divisors (19525087664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18002791648 is a wasteful number, since it uses less digits than its factorization.

18002791648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33093394 (or 33093386 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 18002791648 in words is "eighteen billion, two million, seven hundred ninety-one thousand, six hundred forty-eight".