3666666999 has 4 divisors (see below), whose sum is σ = 4888889336. Its totient is φ = 2444444664.

The previous prime is 3666666979. The next prime is 3666667001. The reversal of 3666666999 is 9996666663.

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

It is not a de Polignac number, because 3666666999 - 2¹² = 3666662903 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666666929) 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, 611111164 + ... + 611111169.

It is an arithmetic number, because the mean of its divisors is an integer number (1222222334).

Almost surely, 2^3666666999 is an apocalyptic number.

3666666999 is a deficient number, since it is larger than the sum of its proper divisors (1222222337).

3666666999 is a wasteful number, since it uses less digits than its factorization.

3666666999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222222336.

The product of its digits is 102036672, while the sum is 66.

The square root of 3666666999 is about 60553.0098261020. The cubic root of 3666666999 is about 1542.0217163153.

The spelling of 3666666999 in words is "three billion, six hundred sixty-six million, six hundred sixty-six thousand, nine hundred ninety-nine".