618566 has 16 divisors (see below), whose sum is σ = 1027824. Its totient is φ = 277344.

The previous prime is 618559. The next prime is 618571. The reversal of 618566 is 665816.

It is a congruent number.

It is an unprimeable number.

618566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (64239).

2⁶¹⁸⁵⁶⁶ is an apocalyptic number.

618566 is a deficient number, since it is larger than the sum of its proper divisors (409258).

618566 is a wasteful number, since it uses less digits than its factorization.

618566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

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

The square root of 618566 is about 786.4896693536. The cubic root of 618566 is about 85.2043985180.

The spelling of 618566 in words is "six hundred eighteen thousand, five hundred sixty-six".