17968990815 has 24 divisors (see below), whose sum is σ = 32150971008. Its totient is φ = 9274317120.

The previous prime is 17968990811. The next prime is 17968990873. The reversal of 17968990815 is 51809986971.

It is not a de Polignac number, because 17968990815 - 2² = 17968990811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17968990811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6439104 + ... + 6441893.

It is an arithmetic number, because the mean of its divisors is an integer number (1339623792).

Almost surely, 2^17968990815 is an apocalyptic number.

17968990815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

17968990815 is a deficient number, since it is larger than the sum of its proper divisors (14181980193).

17968990815 is a wasteful number, since it uses less digits than its factorization.

17968990815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12881039 (or 12881036 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 17968990815 in words is "seventeen billion, nine hundred sixty-eight million, nine hundred ninety thousand, eight hundred fifteen".