18917049827 has 16 divisors (see below), whose sum is σ = 21091136640. Its totient is φ = 16846607232.

The previous prime is 18917049797. The next prime is 18917049839. The reversal of 18917049827 is 72894071981.

It is not a de Polignac number, because 18917049827 - 2¹⁰ = 18917048803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18917049427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481373 + ... + 519185.

It is an arithmetic number, because the mean of its divisors is an integer number (1318196040).

Almost surely, 2^18917049827 is an apocalyptic number.

18917049827 is a deficient number, since it is larger than the sum of its proper divisors (2174086813).

18917049827 is a wasteful number, since it uses less digits than its factorization.

18917049827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39182.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 18917049827 in words is "eighteen billion, nine hundred seventeen million, forty-nine thousand, eight hundred twenty-seven".