166057655 has 4 divisors (see below), whose sum is σ = 199269192. Its totient is φ = 132846120.

The previous prime is 166057651. The next prime is 166057679. The reversal of 166057655 is 556750661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556750661 = 113 ⋅4926997.

It is not a de Polignac number, because 166057655 - 2² = 166057651 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 (166057651) 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, 16605761 + ... + 16605770.

It is an arithmetic number, because the mean of its divisors is an integer number (49817298).

Almost surely, 2^166057655 is an apocalyptic number.

166057655 is a deficient number, since it is larger than the sum of its proper divisors (33211537).

166057655 is an equidigital number, since it uses as much as digits as its factorization.

166057655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33211536.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 166057655 is about 12886.3359804096. The cubic root of 166057655 is about 549.6500859693.

The spelling of 166057655 in words is "one hundred sixty-six million, fifty-seven thousand, six hundred fifty-five".