2171662543 has 4 divisors (see below), whose sum is σ = 2172974800. Its totient is φ = 2170350288.

The previous prime is 2171662511. The next prime is 2171662573. The reversal of 2171662543 is 3452661712.

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 2171662543 - 2⁵ = 2171662511 is a prime.

It is a super-2 number, since 2×2171662543² = 9432236401338453698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171662573) 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, 653643 + ... + 656956.

It is an arithmetic number, because the mean of its divisors is an integer number (543243700).

Almost surely, 2^2171662543 is an apocalyptic number.

2171662543 is a deficient number, since it is larger than the sum of its proper divisors (1312257).

2171662543 is a wasteful number, since it uses less digits than its factorization.

2171662543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312256.

The product of its digits is 60480, while the sum is 37.

The square root of 2171662543 is about 46601.1002337928. The cubic root of 2171662543 is about 1294.9831381753.

The spelling of 2171662543 in words is "two billion, one hundred seventy-one million, six hundred sixty-two thousand, five hundred forty-three".