18927641361 has 4 divisors (see below), whose sum is σ = 25236855152. Its totient is φ = 12618427572.

The previous prime is 18927641347. The next prime is 18927641389. The reversal of 18927641361 is 16314672981.

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 not a de Polignac number, because 18927641361 - 2⁷ = 18927641233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18927641361.

It is not an unprimeable number, because it can be changed into a prime (18927642361) 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, 3154606891 + ... + 3154606896.

It is an arithmetic number, because the mean of its divisors is an integer number (6309213788).

Almost surely, 2^18927641361 is an apocalyptic number.

It is an amenable number.

18927641361 is a deficient number, since it is larger than the sum of its proper divisors (6309213791).

18927641361 is an equidigital number, since it uses as much as digits as its factorization.

18927641361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309213790.

The product of its digits is 435456, while the sum is 48.

The spelling of 18927641361 in words is "eighteen billion, nine hundred twenty-seven million, six hundred forty-one thousand, three hundred sixty-one".