166782478 has 12 divisors (see below), whose sum is σ = 265756392. Its totient is φ = 78485600.

The previous prime is 166782457. The next prime is 166782481. The reversal of 166782478 is 874287661.

It is a happy number.

166782478 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 an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143698 + ... + 144853.

It is an arithmetic number, because the mean of its divisors is an integer number (22146366).

Almost surely, 2^166782478 is an apocalyptic number.

166782478 is a deficient number, since it is larger than the sum of its proper divisors (98973914).

166782478 is a wasteful number, since it uses less digits than its factorization.

166782478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288587 (or 288570 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The square root of 166782478 is about 12914.4290620995. The cubic root of 166782478 is about 550.4486455020.

The spelling of 166782478 in words is "one hundred sixty-six million, seven hundred eighty-two thousand, four hundred seventy-eight".