366631666 has 4 divisors (see below), whose sum is σ = 549947502. Its totient is φ = 183315832.

The previous prime is 366631651. The next prime is 366631669. The reversal of 366631666 is 666136663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666136663 = 929 ⋅717047.

It can be written as a sum of positive squares in only one way, i.e., 274068025 + 92563641 = 16555^2 + 9621^2 .

It is not an unprimeable number, because it can be changed into a prime (366631669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91657915 + ... + 91657918.

Almost surely, 2^366631666 is an apocalyptic number.

366631666 is a deficient number, since it is larger than the sum of its proper divisors (183315836).

366631666 is a wasteful number, since it uses less digits than its factorization.

366631666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183315835.

The product of its digits is 419904, while the sum is 43.

The square root of 366631666 is about 19147.6282082142. The cubic root of 366631666 is about 715.7202815385.

The spelling of 366631666 in words is "three hundred sixty-six million, six hundred thirty-one thousand, six hundred sixty-six".