166630641 has 4 divisors (see below), whose sum is σ = 222174192. Its totient is φ = 111087092.

The previous prime is 166630637. The next prime is 166630657. The reversal of 166630641 is 146036661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166630641 - 2² = 166630637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166630621) 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, 27771771 + ... + 27771776.

It is an arithmetic number, because the mean of its divisors is an integer number (55543548).

Almost surely, 2^166630641 is an apocalyptic number.

It is an amenable number.

166630641 is a deficient number, since it is larger than the sum of its proper divisors (55543551).

166630641 is an equidigital number, since it uses as much as digits as its factorization.

166630641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55543550.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 166630641 is about 12908.5491438814. The cubic root of 166630641 is about 550.2815539150.

The spelling of 166630641 in words is "one hundred sixty-six million, six hundred thirty thousand, six hundred forty-one".