18261385016 has 32 divisors (see below), whose sum is σ = 40393850880. Its totient is φ = 7573845600.

The previous prime is 18261384971. The next prime is 18261385033. The reversal of 18261385016 is 61058316281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5257880 + ... + 5261351.

It is an arithmetic number, because the mean of its divisors is an integer number (1262307840).

Almost surely, 2^18261385016 is an apocalyptic number.

It is an amenable number.

18261385016 is an abundant number, since it is smaller than the sum of its proper divisors (22132465864).

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

18261385016 is a wasteful number, since it uses less digits than its factorization.

18261385016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10519275 (or 10519271 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 18261385016 in words is "eighteen billion, two hundred sixty-one million, three hundred eighty-five thousand, sixteen".