18677855988 has 192 divisors, whose sum is σ = 55789440000. Its totient is φ = 5344444800.

The previous prime is 18677855879. The next prime is 18677856011. The reversal of 18677855988 is 88955877681.

18677855988 is a `hidden beast` number, since 1 + 8 + 67 + 7 + 8 + 559 + 8 + 8 = 666.

It is a super-2 number, since 2×18677855988² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7876443 + ... + 7878813.

It is an arithmetic number, because the mean of its divisors is an integer number (290570000).

Almost surely, 2^18677855988 is an apocalyptic number.

18677855988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18677855988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27894720000).

18677855988 is an abundant number, since it is smaller than the sum of its proper divisors (37111584012).

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

18677855988 is a wasteful number, since it uses less digits than its factorization.

18677855988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763 (or 2755 counting only the distinct ones).

The product of its digits is 270950400, while the sum is 72.

The spelling of 18677855988 in words is "eighteen billion, six hundred seventy-seven million, eight hundred fifty-five thousand, nine hundred eighty-eight".