3664181891 has 6 divisors (see below), whose sum is σ = 3765891780. Its totient is φ = 3565148616.

The previous prime is 3664181881. The next prime is 3664181933. The reversal of 3664181891 is 1981814663.

It is a de Polignac number, because none of the positive numbers 2^k-3664181891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3664181881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1336901 + ... + 1339638.

It is an arithmetic number, because the mean of its divisors is an integer number (627648630).

Almost surely, 2^3664181891 is an apocalyptic number.

3664181891 is a deficient number, since it is larger than the sum of its proper divisors (101709889).

3664181891 is an equidigital number, since it uses as much as digits as its factorization.

3664181891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676613 (or 2676576 counting only the distinct ones).

The product of its digits is 248832, while the sum is 47.

The square root of 3664181891 is about 60532.4862449908. The cubic root of 3664181891 is about 1541.6732657495.

The spelling of 3664181891 in words is "three billion, six hundred sixty-four million, one hundred eighty-one thousand, eight hundred ninety-one".