6655657 has 4 divisors (see below), whose sum is σ = 6672340. Its totient is φ = 6638976.

The previous prime is 6655651. The next prime is 6655661. The reversal of 6655657 is 7565566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6270016 + 385641 = 2504^2 + 621^2 .

It is a cyclic number.

It is not a de Polignac number, because 6655657 - 2¹⁹ = 6131369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6655651) 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, 7728 + ... + 8545.

It is an arithmetic number, because the mean of its divisors is an integer number (1668085).

Almost surely, 2^6655657 is an apocalyptic number.

It is an amenable number.

6655657 is a deficient number, since it is larger than the sum of its proper divisors (16683).

6655657 is a wasteful number, since it uses less digits than its factorization.

6655657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16682.

The product of its digits is 189000, while the sum is 40.

The square root of 6655657 is about 2579.8560037335. The cubic root of 6655657 is about 188.1035437610.

Subtracting 6655657 from its reverse (7565566), we obtain a palindrome (909909).

The spelling of 6655657 in words is "six million, six hundred fifty-five thousand, six hundred fifty-seven".