655626665 has 4 divisors (see below), whose sum is σ = 786752004. Its totient is φ = 524501328.

The previous prime is 655626649. The next prime is 655626667. The reversal of 655626665 is 566626556.

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 284833129 + 370793536 = 16877^2 + 19256^2 .

It is a cyclic number.

It is not a de Polignac number, because 655626665 - 2⁴ = 655626649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655626667) 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, 65562662 + ... + 65562671.

It is an arithmetic number, because the mean of its divisors is an integer number (196688001).

Almost surely, 2^655626665 is an apocalyptic number.

It is an amenable number.

655626665 is a deficient number, since it is larger than the sum of its proper divisors (131125339).

655626665 is a wasteful number, since it uses less digits than its factorization.

655626665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131125338.

The product of its digits is 1944000, while the sum is 47.

The square root of 655626665 is about 25605.2077710766. The cubic root of 655626665 is about 868.7314338630.

It can be divided in two parts, 65562 and 6665, that added together give a palindrome (72227).

The spelling of 655626665 in words is "six hundred fifty-five million, six hundred twenty-six thousand, six hundred sixty-five".