655716665 has 4 divisors (see below), whose sum is σ = 786860004. Its totient is φ = 524573328.

The previous prime is 655716653. The next prime is 655716679. The reversal of 655716665 is 566617556.

655716665 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 391881616 + 263835049 = 19796^2 + 16243^2 .

It is a cyclic number.

It is not a de Polignac number, because 655716665 - 2⁸ = 655716409 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, 65571662 + ... + 65571671.

It is an arithmetic number, because the mean of its divisors is an integer number (196715001).

Almost surely, 2^655716665 is an apocalyptic number.

It is an amenable number.

655716665 is a deficient number, since it is larger than the sum of its proper divisors (131143339).

655716665 is a wasteful number, since it uses less digits than its factorization.

655716665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131143338.

The product of its digits is 1134000, while the sum is 47.

The square root of 655716665 is about 25606.9651657513. The cubic root of 655716665 is about 868.7711832386.

The spelling of 655716665 in words is "six hundred fifty-five million, seven hundred sixteen thousand, six hundred sixty-five".