166556002 has 4 divisors (see below), whose sum is σ = 249834006. Its totient is φ = 83278000.

The previous prime is 166555979. The next prime is 166556003. The reversal of 166556002 is 200655661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200655661 = 7001 ⋅28661.

It can be written as a sum of positive squares in only one way, i.e., 86471401 + 80084601 = 9299^2 + 8949^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (166556003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41638999 + ... + 41639002.

Almost surely, 2^166556002 is an apocalyptic number.

166556002 is a deficient number, since it is larger than the sum of its proper divisors (83278004).

166556002 is an equidigital number, since it uses as much as digits as its factorization.

166556002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83278003.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 166556002 is about 12905.6577515445. The cubic root of 166556002 is about 550.1993789546.

The spelling of 166556002 in words is "one hundred sixty-six million, five hundred fifty-six thousand, two".