18910987911 has 24 divisors (see below), whose sum is σ = 27466158720. Its totient is φ = 12538127376.

The previous prime is 18910987891. The next prime is 18910987919. The reversal of 18910987911 is 11978901981.

It is not a de Polignac number, because 18910987911 - 2¹³ = 18910979719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18910987919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1458720 + ... + 1471626.

It is an arithmetic number, because the mean of its divisors is an integer number (1144423280).

Almost surely, 2^18910987911 is an apocalyptic number.

18910987911 is a deficient number, since it is larger than the sum of its proper divisors (8555170809).

18910987911 is a wasteful number, since it uses less digits than its factorization.

18910987911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13795 (or 13792 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 54.

The spelling of 18910987911 in words is "eighteen billion, nine hundred ten million, nine hundred eighty-seven thousand, nine hundred eleven".