6664697 has 16 divisors (see below), whose sum is σ = 7756560. Its totient is φ = 5670912.

The previous prime is 6664667. The next prime is 6664711. The reversal of 6664697 is 7964666.

It can be written as a sum of positive squares in 8 ways, for example, as 90601 + 6574096 = 301^2 + 2564^2 .

It is not a de Polignac number, because 6664697 - 2¹⁰ = 6663673 is a prime.

It is a super-2 number, since 2×6664697² = 88836372203618, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11429 + ... + 11997.

It is an arithmetic number, because the mean of its divisors is an integer number (484785).

Almost surely, 2^6664697 is an apocalyptic number.

It is an amenable number.

6664697 is a deficient number, since it is larger than the sum of its proper divisors (1091863).

6664697 is a wasteful number, since it uses less digits than its factorization.

6664697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its digits is 326592, while the sum is 44.

The square root of 6664697 is about 2581.6074449846. The cubic root of 6664697 is about 188.1886686775.

The spelling of 6664697 in words is "six million, six hundred sixty-four thousand, six hundred ninety-seven".