18720146888 has 32 divisors (see below), whose sum is σ = 35240973600. Its totient is φ = 9322604928.

The previous prime is 18720146873. The next prime is 18720146923. The reversal of 18720146888 is 88864102781.

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, 4312223 + ... + 4316561.

It is an arithmetic number, because the mean of its divisors is an integer number (1101280425).

Almost surely, 2^18720146888 is an apocalyptic number.

It is an amenable number.

18720146888 is a deficient number, since it is larger than the sum of its proper divisors (16520826712).

18720146888 is a wasteful number, since it uses less digits than its factorization.

18720146888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6381 (or 6377 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 53.

The spelling of 18720146888 in words is "eighteen billion, seven hundred twenty million, one hundred forty-six thousand, eight hundred eighty-eight".