166104557 has 4 divisors (see below), whose sum is σ = 166168800. Its totient is φ = 166040316.

The previous prime is 166104539. The next prime is 166104563. The reversal of 166104557 is 755401661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755401661 = 7 ⋅107914523.

It is a cyclic number.

It is not a de Polignac number, because 166104557 - 2⁶ = 166104493 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 (166104577) 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 3 ways as a sum of consecutive naturals, for example, 28073 + ... + 33470.

It is an arithmetic number, because the mean of its divisors is an integer number (41542200).

Almost surely, 2^166104557 is an apocalyptic number.

It is an amenable number.

166104557 is a deficient number, since it is larger than the sum of its proper divisors (64243).

166104557 is an equidigital number, since it uses as much as digits as its factorization.

166104557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64242.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 166104557 is about 12888.1556865209. The cubic root of 166104557 is about 549.7018295672.

It can be divided in two parts, 166104 and 557, that added together give a palindrome (166661).

The spelling of 166104557 in words is "one hundred sixty-six million, one hundred four thousand, five hundred fifty-seven".