18027561311906 has 4 divisors (see below), whose sum is σ = 27041341967862. Its totient is φ = 9013780655952.

The previous prime is 18027561311863. The next prime is 18027561311927. The reversal of 18027561311906 is 60911316572081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16795317007681 + 1232244304225 = 4098209^2 + 1110065^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4506890327975 + ... + 4506890327978.

Almost surely, 2^{18027561311906} is an apocalyptic number.

18027561311906 is a deficient number, since it is larger than the sum of its proper divisors (9013780655956).

18027561311906 is an equidigital number, since it uses as much as digits as its factorization.

18027561311906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9013780655955.

The product of its (nonzero) digits is 544320, while the sum is 50.

Adding to 18027561311906 its reverse (60911316572081), we get a palindrome (78938877883987).

The spelling of 18027561311906 in words is "eighteen trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, nine hundred six".