166240778 has 32 divisors (see below), whose sum is σ = 280680768. Its totient is φ = 73180800.

The previous prime is 166240771. The next prime is 166240787. The reversal of 166240778 is 877042661.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166240771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269126 + ... + 269742.

It is an arithmetic number, because the mean of its divisors is an integer number (8771274).

Almost surely, 2^166240778 is an apocalyptic number.

166240778 is a deficient number, since it is larger than the sum of its proper divisors (114439990).

166240778 is a wasteful number, since it uses less digits than its factorization.

166240778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 166240778 is about 12893.4393394470. The cubic root of 166240778 is about 549.8520571786.

The spelling of 166240778 in words is "one hundred sixty-six million, two hundred forty thousand, seven hundred seventy-eight".