655604261 has 4 divisors (see below), whose sum is σ = 706035372. Its totient is φ = 605173152.

The previous prime is 655604251. The next prime is 655604293. The reversal of 655604261 is 162406556.

655604261 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 can be written as a sum of positive squares in 2 ways, for example, as 115971361 + 539632900 = 10769^2 + 23230^2 .

It is a cyclic number.

It is not a de Polignac number, because 655604261 - 2⁶ = 655604197 is a prime.

It is a super-2 number, since 2×655604261² = 859633894082712242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655604251) 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, 25215536 + ... + 25215561.

It is an arithmetic number, because the mean of its divisors is an integer number (176508843).

Almost surely, 2^655604261 is an apocalyptic number.

It is an amenable number.

655604261 is a deficient number, since it is larger than the sum of its proper divisors (50431111).

655604261 is a wasteful number, since it uses less digits than its factorization.

655604261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50431110.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 655604261 is about 25604.7702782118. The cubic root of 655604261 is about 868.7215383530.

The spelling of 655604261 in words is "six hundred fifty-five million, six hundred four thousand, two hundred sixty-one".