18741081438861 has 4 divisors (see below), whose sum is σ = 24988108585152. Its totient is φ = 12494054292572.

The previous prime is 18741081438857. The next prime is 18741081438899. The reversal of 18741081438861 is 16883418014781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18741081438861 - 2² = 18741081438857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18741081438795 and 18741081438804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18741081438811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3123513573141 + ... + 3123513573146.

It is an arithmetic number, because the mean of its divisors is an integer number (6247027146288).

Almost surely, 2^{18741081438861} is an apocalyptic number.

It is an amenable number.

18741081438861 is a deficient number, since it is larger than the sum of its proper divisors (6247027146291).

18741081438861 is an equidigital number, since it uses as much as digits as its factorization.

18741081438861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247027146290.

The product of its (nonzero) digits is 8257536, while the sum is 60.

The spelling of 18741081438861 in words is "eighteen trillion, seven hundred forty-one billion, eighty-one million, four hundred thirty-eight thousand, eight hundred sixty-one".