1666906839 has 24 divisors (see below), whose sum is σ = 2606436560. Its totient is φ = 1020460032.

The previous prime is 1666906817. The next prime is 1666906847. The reversal of 1666906839 is 9386096661.

It is not a de Polignac number, because 1666906839 - 2²³ = 1658518231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666906889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14329 + ... + 59490.

Almost surely, 2^1666906839 is an apocalyptic number.

1666906839 is a deficient number, since it is larger than the sum of its proper divisors (939529721).

1666906839 is a wasteful number, since it uses less digits than its factorization.

1666906839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74031 (or 74028 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 1666906839 is about 40827.7704387590. The cubic root of 1666906839 is about 1185.6880499189.

The spelling of 1666906839 in words is "one billion, six hundred sixty-six million, nine hundred six thousand, eight hundred thirty-nine".