166278749 has 16 divisors (see below), whose sum is σ = 206575488. Its totient is φ = 130324032.

The previous prime is 166278733. The next prime is 166278757. The reversal of 166278749 is 947872661.

It is a cyclic number.

It is not a de Polignac number, because 166278749 - 2⁴ = 166278733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166278697 and 166278706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166278719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199 + ... + 18275.

It is an arithmetic number, because the mean of its divisors is an integer number (12910968).

Almost surely, 2^166278749 is an apocalyptic number.

It is an amenable number.

166278749 is a deficient number, since it is larger than the sum of its proper divisors (40296739).

166278749 is a wasteful number, since it uses less digits than its factorization.

166278749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17204.

The product of its digits is 1016064, while the sum is 50.

The square root of 166278749 is about 12894.9117484378. The cubic root of 166278749 is about 549.8939178326.

The spelling of 166278749 in words is "one hundred sixty-six million, two hundred seventy-eight thousand, seven hundred forty-nine".