166076661 has 4 divisors (see below), whose sum is σ = 221435552. Its totient is φ = 110717772.

The previous prime is 166076653. The next prime is 166076671. The reversal of 166076661 is 166670661.

166076661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166670661 = 3 ⋅55556887.

It is not a de Polignac number, because 166076661 - 2³ = 166076653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166076671) 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, 27679441 + ... + 27679446.

It is an arithmetic number, because the mean of its divisors is an integer number (55358888).

Almost surely, 2^166076661 is an apocalyptic number.

It is an amenable number.

166076661 is a deficient number, since it is larger than the sum of its proper divisors (55358891).

166076661 is an equidigital number, since it uses as much as digits as its factorization.

166076661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55358890.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 166076661 is about 12887.0734071006. The cubic root of 166076661 is about 549.6710550939.

The spelling of 166076661 in words is "one hundred sixty-six million, seventy-six thousand, six hundred sixty-one".