8138183666 has 4 divisors (see below), whose sum is σ = 12207275502. Its totient is φ = 4069091832.

The previous prime is 8138183639. The next prime is 8138183687. The reversal of 8138183666 is 6663818318.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 7455459025 + 682724641 = 86345^2 + 26129^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2034545915 + ... + 2034545918.

Almost surely, 2^8138183666 is an apocalyptic number.

8138183666 is a deficient number, since it is larger than the sum of its proper divisors (4069091836).

8138183666 is a wasteful number, since it uses less digits than its factorization.

8138183666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069091835.

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

The square root of 8138183666 is about 90211.8820666103. The cubic root of 8138183666 is about 2011.4496333663.

The spelling of 8138183666 in words is "eight billion, one hundred thirty-eight million, one hundred eighty-three thousand, six hundred sixty-six".