655405645 has 8 divisors (see below), whose sum is σ = 787853304. Its totient is φ = 523413504.

The previous prime is 655405633. The next prime is 655405649. The reversal of 655405645 is 546504556.

It can be written as a sum of positive squares in 4 ways, for example, as 360012676 + 295392969 = 18974^2 + 17187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655405645 - 2¹³ = 655397453 is a prime.

It is a super-3 number, since 3×655405645³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655405598 and 655405607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655405649) 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 7 ways as a sum of consecutive naturals, for example, 110704 + ... + 116473.

It is an arithmetic number, because the mean of its divisors is an integer number (98481663).

Almost surely, 2^655405645 is an apocalyptic number.

It is an amenable number.

655405645 is a deficient number, since it is larger than the sum of its proper divisors (132447659).

655405645 is a wasteful number, since it uses less digits than its factorization.

655405645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227759.

The product of its (nonzero) digits is 360000, while the sum is 40.

The square root of 655405645 is about 25600.8914883838. The cubic root of 655405645 is about 868.6338027914.

The spelling of 655405645 in words is "six hundred fifty-five million, four hundred five thousand, six hundred forty-five".