18021811276 has 24 divisors (see below), whose sum is σ = 37610737920. Its totient is φ = 7387822992.

The previous prime is 18021811261. The next prime is 18021811307. The reversal of 18021811276 is 67211812081.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13991446 + ... + 13992733.

It is an arithmetic number, because the mean of its divisors is an integer number (1567114080).

Almost surely, 2^18021811276 is an apocalyptic number.

It is an amenable number.

18021811276 is an abundant number, since it is smaller than the sum of its proper divisors (19588926644).

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

18021811276 is a wasteful number, since it uses less digits than its factorization.

18021811276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27984213 (or 27984211 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 37.

The spelling of 18021811276 in words is "eighteen billion, twenty-one million, eight hundred eleven thousand, two hundred seventy-six".