163666730 has 16 divisors (see below), whose sum is σ = 298637064. Its totient is φ = 64569600.

The previous prime is 163666717. The next prime is 163666733. The reversal of 163666730 is 37666361.

It can be written as a sum of positive squares in 4 ways, for example, as 82864609 + 80802121 = 9103^2 + 8989^2 .

It is not an unprimeable number, because it can be changed into a prime (163666733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111371 + ... + 112830.

Almost surely, 2^163666730 is an apocalyptic number.

163666730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163666730 is a deficient number, since it is larger than the sum of its proper divisors (134970334).

163666730 is a wasteful number, since it uses less digits than its factorization.

163666730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224281.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 163666730 is about 12793.2298501981. The cubic root of 163666730 is about 546.9993393685. Note that the first 3 decimals are identical.

The spelling of 163666730 in words is "one hundred sixty-three million, six hundred sixty-six thousand, seven hundred thirty".