166380749 has 4 divisors (see below), whose sum is σ = 170877564. Its totient is φ = 161883936.

The previous prime is 166380707. The next prime is 166380757. The reversal of 166380749 is 947083661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157678249 + 8702500 = 12557^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 166380749 - 2¹² = 166376653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166380769) 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, 2248352 + ... + 2248425.

It is an arithmetic number, because the mean of its divisors is an integer number (42719391).

Almost surely, 2^166380749 is an apocalyptic number.

It is an amenable number.

166380749 is a deficient number, since it is larger than the sum of its proper divisors (4496815).

166380749 is an equidigital number, since it uses as much as digits as its factorization.

166380749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496814.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 166380749 is about 12898.8661904836. The cubic root of 166380749 is about 550.0063349133.

The spelling of 166380749 in words is "one hundred sixty-six million, three hundred eighty thousand, seven hundred forty-nine".