18611441838 has 48 divisors (see below), whose sum is σ = 44647289856. Its totient is φ = 5555650320.

The previous prime is 18611441819. The next prime is 18611441839. The reversal of 18611441838 is 83814411681.

18611441838 is a `hidden beast` number, since 18 + 611 + 4 + 4 + 18 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18611441793 and 18611441802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18611441839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 688206 + ... + 714737.

It is an arithmetic number, because the mean of its divisors is an integer number (930151872).

Almost surely, 2^18611441838 is an apocalyptic number.

18611441838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18611441838 is an abundant number, since it is smaller than the sum of its proper divisors (26035848018).

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

18611441838 is a wasteful number, since it uses less digits than its factorization.

18611441838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403029 (or 1403026 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The spelling of 18611441838 in words is "eighteen billion, six hundred eleven million, four hundred forty-one thousand, eight hundred thirty-eight".