166648774 has 4 divisors (see below), whose sum is σ = 249973164. Its totient is φ = 83324386.

The previous prime is 166648771. The next prime is 166648787. The reversal of 166648774 is 477846661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 477846661 = 6037 ⋅79153.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166648771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41662192 + ... + 41662195.

It is an arithmetic number, because the mean of its divisors is an integer number (62493291).

Almost surely, 2^166648774 is an apocalyptic number.

166648774 is a deficient number, since it is larger than the sum of its proper divisors (83324390).

166648774 is an equidigital number, since it uses as much as digits as its factorization.

166648774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83324389.

The product of its digits is 1354752, while the sum is 49.

The square root of 166648774 is about 12909.2514887580. The cubic root of 166648774 is about 550.3015140165.

The spelling of 166648774 in words is "one hundred sixty-six million, six hundred forty-eight thousand, seven hundred seventy-four".