18611441840 has 40 divisors (see below), whose sum is σ = 44088057648. Its totient is φ = 7304111360.

The previous prime is 18611441839. The next prime is 18611441861. The reversal of 18611441840 is 4814411681.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 18611441794 and 18611441803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2190506 + ... + 2198985.

Almost surely, 2^18611441840 is an apocalyptic number.

18611441840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18611441840 is an abundant number, since it is smaller than the sum of its proper divisors (25476615808).

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

18611441840 is a wasteful number, since it uses less digits than its factorization.

18611441840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389557 (or 4389551 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The spelling of 18611441840 in words is "eighteen billion, six hundred eleven million, four hundred forty-one thousand, eight hundred forty".