166448557 has 4 divisors (see below), whose sum is σ = 181580256. Its totient is φ = 151316860.

The previous prime is 166448551. The next prime is 166448593. The reversal of 166448557 is 755844661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166448557 - 2¹¹ = 166446509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166448551) 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, 7565833 + ... + 7565854.

It is an arithmetic number, because the mean of its divisors is an integer number (45395064).

Almost surely, 2^166448557 is an apocalyptic number.

It is an amenable number.

166448557 is a deficient number, since it is larger than the sum of its proper divisors (15131699).

166448557 is a wasteful number, since it uses less digits than its factorization.

166448557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15131698.

The product of its digits is 806400, while the sum is 46.

The square root of 166448557 is about 12901.4943708084. The cubic root of 166448557 is about 550.0810426032.

The spelling of 166448557 in words is "one hundred sixty-six million, four hundred forty-eight thousand, five hundred fifty-seven".