18909471699 has 6 divisors (see below), whose sum is σ = 27313681356. Its totient is φ = 12606314460.

The previous prime is 18909471661. The next prime is 18909471709. The reversal of 18909471699 is 99617490981.

18909471699 is a `hidden beast` number, since 18 + 90 + 9 + 471 + 69 + 9 = 666.

It is not a de Polignac number, because 18909471699 - 2¹⁶ = 18909406163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18909471499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1050526197 + ... + 1050526214.

It is an arithmetic number, because the mean of its divisors is an integer number (4552280226).

Almost surely, 2^18909471699 is an apocalyptic number.

18909471699 is a deficient number, since it is larger than the sum of its proper divisors (8404209657).

18909471699 is a wasteful number, since it uses less digits than its factorization.

18909471699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101052417 (or 2101052414 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 63.

The spelling of 18909471699 in words is "eighteen billion, nine hundred nine million, four hundred seventy-one thousand, six hundred ninety-nine".