666562 has 16 divisors (see below), whose sum is σ = 1112832. Its totient is φ = 297360.

The previous prime is 666559. The next prime is 666599. The reversal of 666562 is 265666.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a nialpdrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (69552).

2⁶⁶⁶⁵⁶² is an apocalyptic number.

666562 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

666562 is a deficient number, since it is larger than the sum of its proper divisors (446270).

666562 is a wasteful number, since it uses less digits than its factorization.

666562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873.

The product of its digits is 12960, while the sum is 31.

The square root of 666562 is about 816.4324834302. The cubic root of 666562 is about 87.3534744966.

The spelling of 666562 in words is "six hundred sixty-six thousand, five hundred sixty-two".