18901605988 has 24 divisors (see below), whose sum is σ = 34522326720. Its totient is φ = 9038235360.

The previous prime is 18901605959. The next prime is 18901605997. The reversal of 18901605988 is 88950610981.

It is a super-2 number, since 2×18901605988² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589843 + ... + 621061.

It is an arithmetic number, because the mean of its divisors is an integer number (1438430280).

Almost surely, 2^18901605988 is an apocalyptic number.

It is an amenable number.

18901605988 is a deficient number, since it is larger than the sum of its proper divisors (15620720732).

18901605988 is a wasteful number, since it uses less digits than its factorization.

18901605988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37827 (or 37825 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 55.

The spelling of 18901605988 in words is "eighteen billion, nine hundred one million, six hundred five thousand, nine hundred eighty-eight".