661106 has 8 divisors (see below), whose sum is σ = 1023744. Its totient is φ = 319860.

The previous prime is 661103. The next prime is 661109. The reversal of 661106 is 601166.

It is an interprime number because it is at equal distance from previous prime (661103) and next prime (661109).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×661106² = 874122286472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661103) 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, 5270 + ... + 5393.

It is an arithmetic number, because the mean of its divisors is an integer number (127968).

2⁶⁶¹¹⁰⁶ is an apocalyptic number.

661106 is a deficient number, since it is larger than the sum of its proper divisors (362638).

661106 is a wasteful number, since it uses less digits than its factorization.

661106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10696.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 661106 is about 813.0842514771. The cubic root of 661106 is about 87.1144835385.

It can be divided in two parts, 661 and 106, that added together give a palindrome (767).

The spelling of 661106 in words is "six hundred sixty-one thousand, one hundred six".