166430644 has 12 divisors (see below), whose sum is σ = 298357668. Its totient is φ = 81185600.

The previous prime is 166430609. The next prime is 166430647. The reversal of 166430644 is 446034661.

It can be written as a sum of positive squares in 2 ways, for example, as 32148900 + 134281744 = 5670^2 + 11588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166430647) 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, 507247 + ... + 507574.

It is an arithmetic number, because the mean of its divisors is an integer number (24863139).

Almost surely, 2^166430644 is an apocalyptic number.

It is an amenable number.

166430644 is a deficient number, since it is larger than the sum of its proper divisors (131927024).

166430644 is a wasteful number, since it uses less digits than its factorization.

166430644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014866 (or 1014864 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 166430644 is about 12900.8001302245. The cubic root of 166430644 is about 550.0613088681.

The spelling of 166430644 in words is "one hundred sixty-six million, four hundred thirty thousand, six hundred forty-four".