1661166166 has 12 divisors (see below), whose sum is σ = 2738865276. Its totient is φ = 755075420.

The previous prime is 1661166151. The next prime is 1661166281. The reversal of 1661166166 is 6616611661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3431920 + ... + 3432403.

It is an arithmetic number, because the mean of its divisors is an integer number (228238773).

Almost surely, 2^1661166166 is an apocalyptic number.

1661166166 is a deficient number, since it is larger than the sum of its proper divisors (1077699110).

1661166166 is a wasteful number, since it uses less digits than its factorization.

1661166166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6864347 (or 6864336 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 1661166166 is about 40757.4062717440. The cubic root of 1661166166 is about 1184.3253510524.

The spelling of 1661166166 in words is "one billion, six hundred sixty-one million, one hundred sixty-six thousand, one hundred sixty-six".