1166642222661 has 6 divisors (see below), whose sum is σ = 1685149877190. Its totient is φ = 777761481768.

The previous prime is 1166642222659. The next prime is 1166642222729. The reversal of 1166642222661 is 1662222466611.

It can be written as a sum of positive squares in only one way, i.e., 933648725025 + 232993497636 = 966255^2 + 482694^2 .

It is not a de Polignac number, because 1166642222661 - 2¹ = 1166642222659 is a prime.

It is a super-2 number, since 2×1166642222661² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166642222651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64813456806 + ... + 64813456823.

It is an arithmetic number, because the mean of its divisors is an integer number (280858312865).

Almost surely, 2^{1166642222661} is an apocalyptic number.

It is an amenable number.

1166642222661 is a deficient number, since it is larger than the sum of its proper divisors (518507654529).

1166642222661 is a wasteful number, since it uses less digits than its factorization.

1166642222661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129626913635 (or 129626913632 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The spelling of 1166642222661 in words is "one trillion, one hundred sixty-six billion, six hundred forty-two million, two hundred twenty-two thousand, six hundred sixty-one".