17987549497 has 4 divisors (see below), whose sum is σ = 17990273680. Its totient is φ = 17984825316.

The previous prime is 17987549467. The next prime is 17987549501. The reversal of 17987549497 is 79494578971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79494578971 = 19 ⋅4183925209.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17987549497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17987549467) 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 3 ways as a sum of consecutive naturals, for example, 1352163 + ... + 1365400.

It is an arithmetic number, because the mean of its divisors is an integer number (4497568420).

Almost surely, 2^17987549497 is an apocalyptic number.

It is an amenable number.

17987549497 is a deficient number, since it is larger than the sum of its proper divisors (2724183).

17987549497 is an equidigital number, since it uses as much as digits as its factorization.

17987549497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724182.

The product of its digits is 160030080, while the sum is 70.

The spelling of 17987549497 in words is "seventeen billion, nine hundred eighty-seven million, five hundred forty-nine thousand, four hundred ninety-seven".