17075991978 has 12 divisors (see below), whose sum is σ = 36997982658. Its totient is φ = 5691997320.

The previous prime is 17075991973. The next prime is 17075991979. The reversal of 17075991978 is 87919957071.

It can be written as a sum of positive squares in only one way, i.e., 16999726689 + 76265289 = 130383^2 + 8733^2 .

It is not an unprimeable number, because it can be changed into a prime (17075991973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 474333093 + ... + 474333128.

Almost surely, 2^17075991978 is an apocalyptic number.

17075991978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

17075991978 is an abundant number, since it is smaller than the sum of its proper divisors (19921990680).

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

17075991978 is a wasteful number, since it uses less digits than its factorization.

17075991978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948666229 (or 948666226 counting only the distinct ones).

The product of its (nonzero) digits is 10001880, while the sum is 63.

The spelling of 17075991978 in words is "seventeen billion, seventy-five million, nine hundred ninety-one thousand, nine hundred seventy-eight".