18021515948 has 12 divisors (see below), whose sum is σ = 31539674040. Its totient is φ = 9010180512.

The previous prime is 18021515947. The next prime is 18021515969. The reversal of 18021515948 is 84951512081.

It is a junction number, because it is equal to n+sod(n) for n = 18021515899 and 18021515908.

It is not an unprimeable number, because it can be changed into a prime (18021515947) 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, 69878 + ... + 202301.

It is an arithmetic number, because the mean of its divisors is an integer number (2628306170).

Almost surely, 2^18021515948 is an apocalyptic number.

It is an amenable number.

18021515948 is a deficient number, since it is larger than the sum of its proper divisors (13518158092).

18021515948 is a wasteful number, since it uses less digits than its factorization.

18021515948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288736 (or 288734 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 44.

The spelling of 18021515948 in words is "eighteen billion, twenty-one million, five hundred fifteen thousand, nine hundred forty-eight".