6657943 has 4 divisors (see below), whose sum is σ = 6691600. Its totient is φ = 6624288.

The previous prime is 6657929. The next prime is 6657947. The reversal of 6657943 is 3497566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3497566 = 2 ⋅1748783.

It is a cyclic number.

It is not a de Polignac number, because 6657943 - 2²¹ = 4560791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6657896 and 6657905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657947) 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, 16530 + ... + 16927.

It is an arithmetic number, because the mean of its divisors is an integer number (1672900).

Almost surely, 2^6657943 is an apocalyptic number.

6657943 is a deficient number, since it is larger than the sum of its proper divisors (33657).

6657943 is a wasteful number, since it uses less digits than its factorization.

6657943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33656.

The product of its digits is 136080, while the sum is 40.

The square root of 6657943 is about 2580.2990136804. The cubic root of 6657943 is about 188.1250770962.

The spelling of 6657943 in words is "six million, six hundred fifty-seven thousand, nine hundred forty-three".