166632257 has 4 divisors (see below), whose sum is σ = 181780656. Its totient is φ = 151483860.

The previous prime is 166632239. The next prime is 166632259. The reversal of 166632257 is 752236661.

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: 752236661 = 11 ⋅68385151.

It is not a de Polignac number, because 166632257 - 2¹⁰ = 166631233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166632257.

It is not an unprimeable number, because it can be changed into a prime (166632259) 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, 7574183 + ... + 7574204.

It is an arithmetic number, because the mean of its divisors is an integer number (45445164).

Almost surely, 2^166632257 is an apocalyptic number.

It is an amenable number.

166632257 is a deficient number, since it is larger than the sum of its proper divisors (15148399).

166632257 is a wasteful number, since it uses less digits than its factorization.

166632257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15148398.

The product of its digits is 90720, while the sum is 38.

The square root of 166632257 is about 12908.6117379058. The cubic root of 166632257 is about 550.2833328038.

The spelling of 166632257 in words is "one hundred sixty-six million, six hundred thirty-two thousand, two hundred fifty-seven".