18119581997 has 16 divisors (see below), whose sum is σ = 19897920000. Its totient is φ = 16363224240.

The previous prime is 18119581967. The next prime is 18119582003. The reversal of 18119581997 is 79918591181.

It is not a de Polignac number, because 18119581997 - 2¹² = 18119577901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18119581967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5176754 + ... + 5180252.

It is an arithmetic number, because the mean of its divisors is an integer number (1243620000).

Almost surely, 2^18119581997 is an apocalyptic number.

It is an amenable number.

18119581997 is a deficient number, since it is larger than the sum of its proper divisors (1778338003).

18119581997 is a wasteful number, since it uses less digits than its factorization.

18119581997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6496.

The product of its digits is 1632960, while the sum is 59.

The spelling of 18119581997 in words is "eighteen billion, one hundred nineteen million, five hundred eighty-one thousand, nine hundred ninety-seven".