655557 has 32 divisors (see below), whose sum is σ = 1105920. Its totient is φ = 336960.

The previous prime is 655547. The next prime is 655559. The reversal of 655557 is 755556.

It is not a de Polignac number, because 655557 - 2⁴ = 655541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12343 + ... + 12395.

It is an arithmetic number, because the mean of its divisors is an integer number (34560).

2⁶⁵⁵⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

655557 is a deficient number, since it is larger than the sum of its proper divisors (450363).

655557 is a wasteful number, since it uses less digits than its factorization.

655557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113.

The product of its digits is 26250, while the sum is 33.

The square root of 655557 is about 809.6647454348. The cubic root of 655557 is about 86.8700663140.

Subtracting 655557 from its reverse (755556), we obtain a palindrome (99999).

The spelling of 655557 in words is "six hundred fifty-five thousand, five hundred fifty-seven".