655017779 has 4 divisors (see below), whose sum is σ = 705403776. Its totient is φ = 604631784.

The previous prime is 655017773. The next prime is 655017787. The reversal of 655017779 is 977710556.

655017779 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 a cyclic number.

It is not a de Polignac number, because 655017779 - 2⁸ = 655017523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655017773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25192979 + ... + 25193004.

It is an arithmetic number, because the mean of its divisors is an integer number (176350944).

Almost surely, 2^655017779 is an apocalyptic number.

655017779 is a deficient number, since it is larger than the sum of its proper divisors (50385997).

655017779 is a wasteful number, since it uses less digits than its factorization.

655017779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50385996.

The product of its (nonzero) digits is 463050, while the sum is 47.

The square root of 655017779 is about 25593.3151232895. The cubic root of 655017779 is about 868.4624178361.

The spelling of 655017779 in words is "six hundred fifty-five million, seventeen thousand, seven hundred seventy-nine".