655771555 has 4 divisors (see below), whose sum is σ = 786925872. Its totient is φ = 524617240.

The previous prime is 655771547. The next prime is 655771591. The reversal of 655771555 is 555177556.

655771555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 655771555 - 2³ = 655771547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65577151 + ... + 65577160.

It is an arithmetic number, because the mean of its divisors is an integer number (196731468).

Almost surely, 2^655771555 is an apocalyptic number.

655771555 is a deficient number, since it is larger than the sum of its proper divisors (131154317).

655771555 is a wasteful number, since it uses less digits than its factorization.

655771555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131154316.

The product of its digits is 918750, while the sum is 46.

The square root of 655771555 is about 25608.0369220290. The cubic root of 655771555 is about 868.7954241556.

The spelling of 655771555 in words is "six hundred fifty-five million, seven hundred seventy-one thousand, five hundred fifty-five".