666834843 has 18 divisors (see below), whose sum is σ = 945568596. Its totient is φ = 417929088.

The previous prime is 666834829. The next prime is 666834863. The reversal of 666834843 is 348438666.

It is not a de Polignac number, because 666834843 - 2⁸ = 666834587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666834792 and 666834801.

It is not an unprimeable number, because it can be changed into a prime (666834803) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 759921 + ... + 760797.

Almost surely, 2^666834843 is an apocalyptic number.

666834843 is a deficient number, since it is larger than the sum of its proper divisors (278733753).

666834843 is an frugal number, since it uses more digits than its factorization.

666834843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 897 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 48.

The square root of 666834843 is about 25823.1454900444. The cubic root of 666834843 is about 873.6539163399.

Multiplying 666834843 by its sum of digits (48), we get a square (32008072464 = 178908²).

The spelling of 666834843 in words is "six hundred sixty-six million, eight hundred thirty-four thousand, eight hundred forty-three".