166078278 has 24 divisors (see below), whose sum is σ = 378775800. Its totient is φ = 52445664.

The previous prime is 166078271. The next prime is 166078279. The reversal of 166078278 is 872870661.

166078278 is a `hidden beast` number, since 16 + 607 + 8 + 27 + 8 = 666.

166078278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166078271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242463 + ... + 243146.

It is an arithmetic number, because the mean of its divisors is an integer number (15782325).

Almost surely, 2^166078278 is an apocalyptic number.

166078278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166078278 is an abundant number, since it is smaller than the sum of its proper divisors (212697522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166078278 is a wasteful number, since it uses less digits than its factorization.

166078278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485636 (or 485633 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 166078278 is about 12887.1361442331. The cubic root of 166078278 is about 549.6728390396.

The spelling of 166078278 in words is "one hundred sixty-six million, seventy-eight thousand, two hundred seventy-eight".