3666881138 has 8 divisors (see below), whose sum is σ = 5501831040. Its totient is φ = 1832937460.

The previous prime is 3666881137. The next prime is 3666881149. The reversal of 3666881138 is 8311886663.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (3666881137) 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, 242378 + ... + 257061.

It is an arithmetic number, because the mean of its divisors is an integer number (687728880).

Almost surely, 2^3666881138 is an apocalyptic number.

3666881138 is a deficient number, since it is larger than the sum of its proper divisors (1834949902).

3666881138 is a wasteful number, since it uses less digits than its factorization.

3666881138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503112.

The product of its digits is 995328, while the sum is 50.

The square root of 3666881138 is about 60554.7779948040. Note that the first 3 decimals coincide. The cubic root of 3666881138 is about 1542.0517345454.

The spelling of 3666881138 in words is "three billion, six hundred sixty-six million, eight hundred eighty-one thousand, one hundred thirty-eight".