18531903911 has 2 divisors, whose sum is σ = 18531903912. Its totient is φ = 18531903910.

The previous prime is 18531903823. The next prime is 18531903931. The reversal of 18531903911 is 11930913581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18531903911 - 2¹⁸ = 18531641767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18531903931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265951955 + 9265951956.

It is an arithmetic number, because the mean of its divisors is an integer number (9265951956).

Almost surely, 2^18531903911 is an apocalyptic number.

18531903911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18531903911 is an equidigital number, since it uses as much as digits as its factorization.

18531903911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 18531903911 in words is "eighteen billion, five hundred thirty-one million, nine hundred three thousand, nine hundred eleven".