3664181881 has 2 divisors, whose sum is σ = 3664181882. Its totient is φ = 3664181880.

The previous prime is 3664181797. The next prime is 3664181933. The reversal of 3664181881 is 1881814663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3497539600 + 166642281 = 59140^2 + 12909^2 .

It is a cyclic number.

It is not a de Polignac number, because 3664181881 - 2⁷ = 3664181753 is a prime.

It is a super-2 number, since 2×3664181881² = 26852457714097396322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3664182881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832090940 + 1832090941.

It is an arithmetic number, because the mean of its divisors is an integer number (1832090941).

Almost surely, 2^3664181881 is an apocalyptic number.

It is an amenable number.

3664181881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3664181881 is an equidigital number, since it uses as much as digits as its factorization.

3664181881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 46.

The square root of 3664181881 is about 60532.4861623905. The cubic root of 3664181881 is about 1541.6732643471.

The spelling of 3664181881 in words is "three billion, six hundred sixty-four million, one hundred eighty-one thousand, eight hundred eighty-one".