2161178671 has 4 divisors (see below), whose sum is σ = 2230894144. Its totient is φ = 2091463200.

The previous prime is 2161178639. The next prime is 2161178689. The reversal of 2161178671 is 1768711612.

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 2161178671 - 2⁵ = 2161178639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161118671) 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, 34857690 + ... + 34857751.

It is an arithmetic number, because the mean of its divisors is an integer number (557723536).

Almost surely, 2^2161178671 is an apocalyptic number.

2161178671 is a deficient number, since it is larger than the sum of its proper divisors (69715473).

2161178671 is an equidigital number, since it uses as much as digits as its factorization.

2161178671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69715472.

The product of its digits is 28224, while the sum is 40.

The square root of 2161178671 is about 46488.4789060688. The cubic root of 2161178671 is about 1292.8958980872.

The spelling of 2161178671 in words is "two billion, one hundred sixty-one million, one hundred seventy-eight thousand, six hundred seventy-one".