6437666 has 8 divisors (see below), whose sum is σ = 9675180. Its totient is φ = 3212608.

The previous prime is 6437663. The next prime is 6437671. The reversal of 6437666 is 6667346.

It can be written as a sum of positive squares in 2 ways, for example, as 5387041 + 1050625 = 2321^2 + 1025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6437663) 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, 1691 + ... + 3966.

Almost surely, 2^6437666 is an apocalyptic number.

6437666 is a deficient number, since it is larger than the sum of its proper divisors (3237514).

6437666 is a wasteful number, since it uses less digits than its factorization.

6437666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6228.

The product of its digits is 108864, while the sum is 38.

The square root of 6437666 is about 2537.2556039942. The cubic root of 6437666 is about 186.0270704809.

The spelling of 6437666 in words is "six million, four hundred thirty-seven thousand, six hundred sixty-six".