618665 has 4 divisors (see below), whose sum is σ = 742404. Its totient is φ = 494928.

The previous prime is 618643. The next prime is 618671. The reversal of 618665 is 566816.

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 369664 + 249001 = 608^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 618665 - 2¹² = 614569 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, 61862 + ... + 61871.

It is an arithmetic number, because the mean of its divisors is an integer number (185601).

2⁶¹⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

618665 is a deficient number, since it is larger than the sum of its proper divisors (123739).

618665 is a wasteful number, since it uses less digits than its factorization.

618665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123738.

The product of its digits is 8640, while the sum is 32.

The square root of 618665 is about 786.5526047252. The cubic root of 618665 is about 85.2089438619.

The spelling of 618665 in words is "six hundred eighteen thousand, six hundred sixty-five".