166872047 has 4 divisors (see below), whose sum is σ = 167710800. Its totient is φ = 166033296.

The previous prime is 166872029. The next prime is 166872049. The reversal of 166872047 is 740278661.

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

It is a cyclic number.

It is not a de Polignac number, because 166872047 - 2¹² = 166867951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166871995 and 166872013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166872049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419078 + ... + 419475.

It is an arithmetic number, because the mean of its divisors is an integer number (41927700).

Almost surely, 2^166872047 is an apocalyptic number.

166872047 is a deficient number, since it is larger than the sum of its proper divisors (838753).

166872047 is an equidigital number, since it uses as much as digits as its factorization.

166872047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838752.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 166872047 is about 12917.8963844738. The cubic root of 166872047 is about 550.5471656664.

The spelling of 166872047 in words is "one hundred sixty-six million, eight hundred seventy-two thousand, forty-seven".