655769771 has 4 divisors (see below), whose sum is σ = 656428512. Its totient is φ = 655111032.

The previous prime is 655769749. The next prime is 655769789. The reversal of 655769771 is 177967556.

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

It is a cyclic number.

It is not a de Polignac number, because 655769771 - 2¹⁴ = 655753387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655765771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327875 + ... + 329868.

It is an arithmetic number, because the mean of its divisors is an integer number (164107128).

Almost surely, 2^655769771 is an apocalyptic number.

655769771 is a deficient number, since it is larger than the sum of its proper divisors (658741).

655769771 is an equidigital number, since it uses as much as digits as its factorization.

655769771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658740.

The product of its digits is 2778300, while the sum is 53.

The square root of 655769771 is about 25608.0020891908. The cubic root of 655769771 is about 868.7946363139.

The spelling of 655769771 in words is "six hundred fifty-five million, seven hundred sixty-nine thousand, seven hundred seventy-one".