18621739136 has 512 divisors, whose sum is σ = 53299814400. Its totient is φ = 6244761600.

The previous prime is 18621739099. The next prime is 18621739151. The reversal of 18621739136 is 63193712681.

It is a happy number.

Its product of digits (326592) is a multiple of the sum of its prime divisors (216).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209232980 + ... + 209233068.

It is an arithmetic number, because the mean of its divisors is an integer number (104101200).

Almost surely, 2^18621739136 is an apocalyptic number.

18621739136 is a gapful number since it is divisible by the number (16) 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 18621739136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26649907200).

18621739136 is an abundant number, since it is smaller than the sum of its proper divisors (34678075264).

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

18621739136 is a wasteful number, since it uses less digits than its factorization.

18621739136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 216 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

It can be divided in two parts, 18621 and 739136, that added together give a palindrome (757757).

The spelling of 18621739136 in words is "eighteen billion, six hundred twenty-one million, seven hundred thirty-nine thousand, one hundred thirty-six".