655989555 has 48 divisors (see below), whose sum is σ = 1186050816. Its totient is φ = 308880000.

The previous prime is 655989479. The next prime is 655989559. The reversal of 655989555 is 555989556.

It is not a de Polignac number, because 655989555 - 2¹⁶ = 655924019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 655989495 and 655989504.

It is not an unprimeable number, because it can be changed into a prime (655989559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52680 + ... + 63930.

It is an arithmetic number, because the mean of its divisors is an integer number (24709392).

Almost surely, 2^655989555 is an apocalyptic number.

655989555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

655989555 is a deficient number, since it is larger than the sum of its proper divisors (530061261).

655989555 is a wasteful number, since it uses less digits than its factorization.

655989555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11308 (or 11295 counting only the distinct ones).

The product of its digits is 12150000, while the sum is 57.

The square root of 655989555 is about 25612.2930445519. The cubic root of 655989555 is about 868.8916855328.

Subtracting from 655989555 its reverse (555989556), we obtain a palindrome (99999999).

The spelling of 655989555 in words is "six hundred fifty-five million, nine hundred eighty-nine thousand, five hundred fifty-five".