6501666 has 8 divisors (see below), whose sum is σ = 13003344. Its totient is φ = 2167220.

The previous prime is 6501647. The next prime is 6501689. The reversal of 6501666 is 6661056.

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

6501666 is an admirable number.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541800 + ... + 541811.

It is an arithmetic number, because the mean of its divisors is an integer number (1625418).

Almost surely, 2^6501666 is an apocalyptic number.

6501666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6501666 is a wasteful number, since it uses less digits than its factorization.

6501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083616.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6501666 is about 2549.8364653444. The cubic root of 6501666 is about 186.6415010008.

The spelling of 6501666 in words is "six million, five hundred one thousand, six hundred sixty-six".