18478655488990 has 32 divisors (see below), whose sum is σ = 35189916268320. Its totient is φ = 6966892485504.

The previous prime is 18478655488981. The next prime is 18478655489023. The reversal of 18478655488990 is 9988455687481.

It is a super-2 number, since 2×18478655488990² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246805417 + ... + 246880276.

It is an arithmetic number, because the mean of its divisors is an integer number (1099684883385).

Almost surely, 2^{18478655488990} is an apocalyptic number.

18478655488990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18478655488990 is a deficient number, since it is larger than the sum of its proper divisors (16711260779330).

18478655488990 is a wasteful number, since it uses less digits than its factorization.

18478655488990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493685916.

The product of its (nonzero) digits is 5573836800, while the sum is 82.

The spelling of 18478655488990 in words is "eighteen trillion, four hundred seventy-eight billion, six hundred fifty-five million, four hundred eighty-eight thousand, nine hundred ninety".