18261311776 has 24 divisors (see below), whose sum is σ = 35955647280. Its totient is φ = 9129718848.

The previous prime is 18261311723. The next prime is 18261311797. The reversal of 18261311776 is 67711316281.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371995 + ... + 418213.

It is an arithmetic number, because the mean of its divisors is an integer number (1498151970).

Almost surely, 2^18261311776 is an apocalyptic number.

18261311776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18261311776 is a deficient number, since it is larger than the sum of its proper divisors (17694335504).

18261311776 is a wasteful number, since it uses less digits than its factorization.

18261311776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58576 (or 58568 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The spelling of 18261311776 in words is "eighteen billion, two hundred sixty-one million, three hundred eleven thousand, seven hundred seventy-six".