17947448971 has 4 divisors (see below), whose sum is σ = 17969151672. Its totient is φ = 17925746272.

The previous prime is 17947448957. The next prime is 17947448983. The reversal of 17947448971 is 17984474971.

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

It is a cyclic number.

It is not a de Polignac number, because 17947448971 - 2²⁷ = 17813231243 is a prime.

It is a super-2 number, since 2×17947448971² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17947446971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10850110 + ... + 10851763.

It is an arithmetic number, because the mean of its divisors is an integer number (4492287918).

Almost surely, 2^17947448971 is an apocalyptic number.

17947448971 is a deficient number, since it is larger than the sum of its proper divisors (21702701).

17947448971 is an equidigital number, since it uses as much as digits as its factorization.

17947448971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21702700.

The product of its digits is 14224896, while the sum is 61.

The spelling of 17947448971 in words is "seventeen billion, nine hundred forty-seven million, four hundred forty-eight thousand, nine hundred seventy-one".