612665 has 4 divisors (see below), whose sum is σ = 735204. Its totient is φ = 490128.

The previous prime is 612649. The next prime is 612671. The reversal of 612665 is 566216.

612665 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 182329 + 430336 = 427^2 + 656^2 .

It is a cyclic number.

It is not a de Polignac number, because 612665 - 2⁴ = 612649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 9.

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, 61262 + ... + 61271.

It is an arithmetic number, because the mean of its divisors is an integer number (183801).

2⁶¹²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

612665 is a deficient number, since it is larger than the sum of its proper divisors (122539).

612665 is a wasteful number, since it uses less digits than its factorization.

612665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122538.

The product of its digits is 2160, while the sum is 26.

The square root of 612665 is about 782.7291996598. The cubic root of 612665 is about 84.9325878424.

The spelling of 612665 in words is "six hundred twelve thousand, six hundred sixty-five".