166220842 has 8 divisors (see below), whose sum is σ = 249578532. Its totient is φ = 83028000.

The previous prime is 166220809. The next prime is 166220881. The reversal of 166220842 is 248022661.

166220842 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 161772961 + 4447881 = 12719^2 + 2109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38659 + ... + 42742.

Almost surely, 2^166220842 is an apocalyptic number.

166220842 is a deficient number, since it is larger than the sum of its proper divisors (83357690).

166220842 is a wasteful number, since it uses less digits than its factorization.

166220842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82424.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 166220842 is about 12892.6662099040. Note that the first 3 decimals coincide. The cubic root of 166220842 is about 549.8300764328.

The spelling of 166220842 in words is "one hundred sixty-six million, two hundred twenty thousand, eight hundred forty-two".