655656585656555 has 16 divisors (see below), whose sum is σ = 946511762753280. Its totient is φ = 425930293238112.

The previous prime is 655656585656549. The next prime is 655656585656561. The reversal of 655656585656555 is 555656585656556.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (655656585656549) and next prime (655656585656561).

It is a cyclic number.

It is not a de Polignac number, because 655656585656555 - 2¹⁶ = 655656585591019 is a prime.

It is a super-2 number, since 2×655656585656555² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492974875769 + ... + 492974877098.

It is an arithmetic number, because the mean of its divisors is an integer number (59156985172080).

Almost surely, 2^{655656585656555} is an apocalyptic number.

655656585656555 is a deficient number, since it is larger than the sum of its proper divisors (290855177096725).

655656585656555 is a wasteful number, since it uses less digits than its factorization.

655656585656555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985949752898.

The product of its digits is 121500000000, while the sum is 83.

Subtracting from 655656585656555 its reverse (555656585656556), we obtain a palindrome (99999999999999).

The spelling of 655656585656555 in words is "six hundred fifty-five trillion, six hundred fifty-six billion, five hundred eighty-five million, six hundred fifty-six thousand, five hundred fifty-five".