17987591916 has 288 divisors, whose sum is σ = 57680197120. Its totient is φ = 4786905600.

The previous prime is 17987591861. The next prime is 17987591969. The reversal of 17987591916 is 61919578971.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7884696 + ... + 7886976.

Almost surely, 2^17987591916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17987591916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28840098560).

17987591916 is an abundant number, since it is smaller than the sum of its proper divisors (39692605204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17987591916 is a wasteful number, since it uses less digits than its factorization.

17987591916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387 (or 2373 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 63.

The spelling of 17987591916 in words is "seventeen billion, nine hundred eighty-seven million, five hundred ninety-one thousand, nine hundred sixteen".