17163428978 has 4 divisors (see below), whose sum is σ = 25745143470. Its totient is φ = 8581714488.

The previous prime is 17163428977. The next prime is 17163428981. The reversal of 17163428978 is 87982436171.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11267185609 + 5896243369 = 106147^2 + 76787^2 .

It is not an unprimeable number, because it can be changed into a prime (17163428977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4290857243 + ... + 4290857246.

Almost surely, 2^17163428978 is an apocalyptic number.

17163428978 is a deficient number, since it is larger than the sum of its proper divisors (8581714492).

17163428978 is an equidigital number, since it uses as much as digits as its factorization.

17163428978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8581714491.

The product of its digits is 4064256, while the sum is 56.

The spelling of 17163428978 in words is "seventeen billion, one hundred sixty-three million, four hundred twenty-eight thousand, nine hundred seventy-eight".