166557322 has 4 divisors (see below), whose sum is σ = 249835986. Its totient is φ = 83278660.

The previous prime is 166557319. The next prime is 166557337. The reversal of 166557322 is 223755661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 89661961 + 76895361 = 9469^2 + 8769^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41639329 + ... + 41639332.

Almost surely, 2^166557322 is an apocalyptic number.

166557322 is a deficient number, since it is larger than the sum of its proper divisors (83278664).

166557322 is an equidigital number, since it uses as much as digits as its factorization.

166557322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83278663.

The product of its digits is 75600, while the sum is 37.

The square root of 166557322 is about 12905.7088918044. The cubic root of 166557322 is about 550.2008324423.

The spelling of 166557322 in words is "one hundred sixty-six million, five hundred fifty-seven thousand, three hundred twenty-two".