166051385 has 8 divisors (see below), whose sum is σ = 203021640. Its totient is φ = 130334464.

The previous prime is 166051367. The next prime is 166051387. The reversal of 166051385 is 583150661.

It can be written as a sum of positive squares in 4 ways, for example, as 53860921 + 112190464 = 7339^2 + 10592^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166051385 - 2¹⁶ = 165985849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166051387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313040 + ... + 313569.

It is an arithmetic number, because the mean of its divisors is an integer number (25377705).

Almost surely, 2^166051385 is an apocalyptic number.

It is an amenable number.

166051385 is a deficient number, since it is larger than the sum of its proper divisors (36970255).

166051385 is an equidigital number, since it uses as much as digits as its factorization.

166051385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626667.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 166051385 is about 12886.0926971677. The cubic root of 166051385 is about 549.6431679917.

The spelling of 166051385 in words is "one hundred sixty-six million, fifty-one thousand, three hundred eighty-five".