18988491697 has 8 divisors (see below), whose sum is σ = 21721033152. Its totient is φ = 16260925200.

The previous prime is 18988491679. The next prime is 18988491707. The reversal of 18988491697 is 79619488981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18988491697 - 2²³ = 18980103089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18988491607) 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 7 ways as a sum of consecutive naturals, for example, 1235554 + ... + 1250827.

It is an arithmetic number, because the mean of its divisors is an integer number (2715129144).

Almost surely, 2^18988491697 is an apocalyptic number.

It is an amenable number.

18988491697 is a deficient number, since it is larger than the sum of its proper divisors (2732541455).

18988491697 is a wasteful number, since it uses less digits than its factorization.

18988491697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487479.

The product of its digits is 62705664, while the sum is 70.

The spelling of 18988491697 in words is "eighteen billion, nine hundred eighty-eight million, four hundred ninety-one thousand, six hundred ninety-seven".