4181664887 has 4 divisors (see below), whose sum is σ = 4201483416. Its totient is φ = 4161846360.

The previous prime is 4181664881. The next prime is 4181664899. The reversal of 4181664887 is 7884661814.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4181664887 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 (4181664881) 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, 9908948 + ... + 9909369.

It is an arithmetic number, because the mean of its divisors is an integer number (1050370854).

Almost surely, 2^4181664887 is an apocalyptic number.

4181664887 is a deficient number, since it is larger than the sum of its proper divisors (19818529).

4181664887 is a wasteful number, since it uses less digits than its factorization.

4181664887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19818528.

The product of its digits is 2064384, while the sum is 53.

The square root of 4181664887 is about 64665.7937939371. The cubic root of 4181664887 is about 1611.0774120089.

The spelling of 4181664887 in words is "four billion, one hundred eighty-one million, six hundred sixty-four thousand, eight hundred eighty-seven".