6618647 has 4 divisors (see below), whose sum is σ = 7564176. Its totient is φ = 5673120.

The previous prime is 6618617. The next prime is 6618653. The reversal of 6618647 is 7468166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7468166 = 2 ⋅3734083.

It is a cyclic number.

It is not a de Polignac number, because 6618647 - 2¹⁶ = 6553111 is a prime.

It is a super-2 number, since 2×6618647² = 87612976221218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6618647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618617) 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, 472754 + ... + 472767.

It is an arithmetic number, because the mean of its divisors is an integer number (1891044).

Almost surely, 2^6618647 is an apocalyptic number.

6618647 is a deficient number, since it is larger than the sum of its proper divisors (945529).

6618647 is an equidigital number, since it uses as much as digits as its factorization.

6618647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945528.

The product of its digits is 48384, while the sum is 38.

The square root of 6618647 is about 2572.6731234263. The cubic root of 6618647 is about 187.7542340873.

The spelling of 6618647 in words is "six million, six hundred eighteen thousand, six hundred forty-seven".