661056106 has 4 divisors (see below), whose sum is σ = 991584162. Its totient is φ = 330528052.

The previous prime is 661056049. The next prime is 661056223. The reversal of 661056106 is 601650166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 568107225 + 92948881 = 23835^2 + 9641^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165264025 + ... + 165264028.

Almost surely, 2^661056106 is an apocalyptic number.

661056106 is a deficient number, since it is larger than the sum of its proper divisors (330528056).

661056106 is a wasteful number, since it uses less digits than its factorization.

661056106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330528055.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 661056106 is about 25711.0113764511. The cubic root of 661056106 is about 871.1229195881.

The spelling of 661056106 in words is "six hundred sixty-one million, fifty-six thousand, one hundred six".