166678361 has 4 divisors (see below), whose sum is σ = 167376000. Its totient is φ = 165980724.

The previous prime is 166678349. The next prime is 166678367. The reversal of 166678361 is 163876661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163876661 = 13 ⋅12605897.

It is a cyclic number.

It is not a de Polignac number, because 166678361 - 2²⁶ = 99569497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166678367) 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, 348461 + ... + 348938.

It is an arithmetic number, because the mean of its divisors is an integer number (41844000).

Almost surely, 2^166678361 is an apocalyptic number.

It is an amenable number.

166678361 is a deficient number, since it is larger than the sum of its proper divisors (697639).

166678361 is an equidigital number, since it uses as much as digits as its factorization.

166678361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697638.

The product of its digits is 217728, while the sum is 44.

The square root of 166678361 is about 12910.3973989959. The cubic root of 166678361 is about 550.3340791274.

The spelling of 166678361 in words is "one hundred sixty-six million, six hundred seventy-eight thousand, three hundred sixty-one".