2161868895 has 12 divisors (see below), whose sum is σ = 3747239496. Its totient is φ = 1152996720.

The previous prime is 2161868851. The next prime is 2161868897. The reversal of 2161868895 is 5988681612.

It is a happy number.

It is not a de Polignac number, because 2161868895 - 2¹⁹ = 2161344607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161868897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24020721 + ... + 24020810.

It is an arithmetic number, because the mean of its divisors is an integer number (312269958).

Almost surely, 2^2161868895 is an apocalyptic number.

2161868895 is a deficient number, since it is larger than the sum of its proper divisors (1585370601).

2161868895 is a wasteful number, since it uses less digits than its factorization.

2161868895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48041542 (or 48041539 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 2161868895 is about 46495.9019161904. The cubic root of 2161868895 is about 1293.0335224933.

The spelling of 2161868895 in words is "two billion, one hundred sixty-one million, eight hundred sixty-eight thousand, eight hundred ninety-five".