163366640 has 20 divisors (see below), whose sum is σ = 379827624. Its totient is φ = 65346624.

The previous prime is 163366633. The next prime is 163366649. The reversal of 163366640 is 46663361.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 163366640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163366649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020962 + ... + 1021121.

Almost surely, 2^163366640 is an apocalyptic number.

163366640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163366640 is an abundant number, since it is smaller than the sum of its proper divisors (216460984).

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

163366640 is a wasteful number, since it uses less digits than its factorization.

163366640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042096 (or 2042090 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 163366640 is about 12781.4960000776. The cubic root of 163366640 is about 546.6648192151.

The spelling of 163366640 in words is "one hundred sixty-three million, three hundred sixty-six thousand, six hundred forty".