1661106567206 has 4 divisors (see below), whose sum is σ = 2491659850812. Its totient is φ = 830553283602.

The previous prime is 1661106567199. The next prime is 1661106567217. The reversal of 1661106567206 is 6027656011661.

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

It is a super-2 number, since 2×1661106567206² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent 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, 415276641800 + ... + 415276641803.

It is an arithmetic number, because the mean of its divisors is an integer number (622914962703).

Almost surely, 2^{1661106567206} is an apocalyptic number.

1661106567206 is a deficient number, since it is larger than the sum of its proper divisors (830553283606).

1661106567206 is an equidigital number, since it uses as much as digits as its factorization.

1661106567206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830553283605.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 1661106567206 in words is "one trillion, six hundred sixty-one billion, one hundred six million, five hundred sixty-seven thousand, two hundred six".