166057805 has 8 divisors (see below), whose sum is σ = 199708152. Its totient is φ = 132553728.

The previous prime is 166057789. The next prime is 166057807. The reversal of 166057805 is 508750661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39112516 + 126945289 = 6254^2 + 11267^2 .

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 166057805 - 2⁴ = 166057789 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 (166057807) 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, 34052 + ... + 38621.

It is an arithmetic number, because the mean of its divisors is an integer number (24963519).

Almost surely, 2^166057805 is an apocalyptic number.

It is an amenable number.

166057805 is a deficient number, since it is larger than the sum of its proper divisors (33650347).

166057805 is an equidigital number, since it uses as much as digits as its factorization.

166057805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73135.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 166057805 is about 12886.3418005266. The cubic root of 166057805 is about 549.6502514690.

The spelling of 166057805 in words is "one hundred sixty-six million, fifty-seven thousand, eight hundred five".