6664511 has 4 divisors (see below), whose sum is σ = 7616592. Its totient is φ = 5712432.

The previous prime is 6664501. The next prime is 6664513. The reversal of 6664511 is 1154666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1154666 = 2 ⋅577333.

It is a cyclic number.

It is not a de Polignac number, because 6664511 - 2⁶ = 6664447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664513) 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, 476030 + ... + 476043.

It is an arithmetic number, because the mean of its divisors is an integer number (1904148).

Almost surely, 2^6664511 is an apocalyptic number.

6664511 is a deficient number, since it is larger than the sum of its proper divisors (952081).

6664511 is an equidigital number, since it uses as much as digits as its factorization.

6664511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952080.

The product of its digits is 4320, while the sum is 29.

The square root of 6664511 is about 2581.5714206661. The cubic root of 6664511 is about 188.1869179894.

The spelling of 6664511 in words is "six million, six hundred sixty-four thousand, five hundred eleven".