1666926939 has 16 divisors (see below), whose sum is σ = 2263334400. Its totient is φ = 1091060256.

The previous prime is 1666926917. The next prime is 1666926991. The reversal of 1666926939 is 9396296661.

It is not a de Polignac number, because 1666926939 - 2⁵ = 1666926907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666926439) 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 in 15 ways as a sum of consecutive naturals, for example, 22777 + ... + 62069.

It is an arithmetic number, because the mean of its divisors is an integer number (141458400).

Almost surely, 2^1666926939 is an apocalyptic number.

1666926939 is a deficient number, since it is larger than the sum of its proper divisors (596407461).

1666926939 is a wasteful number, since it uses less digits than its factorization.

1666926939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39554.

The product of its digits is 5668704, while the sum is 57.

The square root of 1666926939 is about 40828.0165940007. The cubic root of 1666926939 is about 1185.6928156790.

The spelling of 1666926939 in words is "one billion, six hundred sixty-six million, nine hundred twenty-six thousand, nine hundred thirty-nine".