6666651 has 8 divisors (see below), whose sum is σ = 9876560. Its totient is φ = 4444416.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666651 is 1566666.

It is not a de Polignac number, because 6666651 - 2⁷ = 6666523 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123430 + ... + 123483.

It is an arithmetic number, because the mean of its divisors is an integer number (1234570).

Almost surely, 2^6666651 is an apocalyptic number.

6666651 is a deficient number, since it is larger than the sum of its proper divisors (3209909).

6666651 is a wasteful number, since it uses less digits than its factorization.

6666651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246922 (or 246916 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 6666651 is about 2581.9858636329. The cubic root of 6666651 is about 188.2070583471.

It can be divided in two parts, 666665 and 1, that added together give a palindrome (666666).

The spelling of 6666651 in words is "six million, six hundred sixty-six thousand, six hundred fifty-one".