17972158478 has 4 divisors (see below), whose sum is σ = 26958237720. Its totient is φ = 8986079238.

The previous prime is 17972158459. The next prime is 17972158511. The reversal of 17972158478 is 87485127971.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4493039618 + ... + 4493039621.

It is an arithmetic number, because the mean of its divisors is an integer number (6739559430).

Almost surely, 2^17972158478 is an apocalyptic number.

17972158478 is a deficient number, since it is larger than the sum of its proper divisors (8986079242).

17972158478 is an equidigital number, since it uses as much as digits as its factorization.

17972158478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8986079241.

The product of its digits is 7902720, while the sum is 59.

The spelling of 17972158478 in words is "seventeen billion, nine hundred seventy-two million, one hundred fifty-eight thousand, four hundred seventy-eight".