166784361 has 4 divisors (see below), whose sum is σ = 222379152. Its totient is φ = 111189572.

The previous prime is 166784347. The next prime is 166784369. The reversal of 166784361 is 163487661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166784361 - 2⁵ = 166784329 is a prime.

It is a super-3 number, since 3×166784361³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (166784369) 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, 27797391 + ... + 27797396.

It is an arithmetic number, because the mean of its divisors is an integer number (55594788).

Almost surely, 2^166784361 is an apocalyptic number.

It is an amenable number.

166784361 is a deficient number, since it is larger than the sum of its proper divisors (55594791).

166784361 is an equidigital number, since it uses as much as digits as its factorization.

166784361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55594790.

The product of its digits is 145152, while the sum is 42.

The square root of 166784361 is about 12914.5019648456. The cubic root of 166784361 is about 550.4507170444.

The spelling of 166784361 in words is "one hundred sixty-six million, seven hundred eighty-four thousand, three hundred sixty-one".