163646540 has 12 divisors (see below), whose sum is σ = 343657776. Its totient is φ = 65458608.

The previous prime is 163646533. The next prime is 163646569. The reversal of 163646540 is 45646361.

It is a self number, because there is not a number n which added to its sum of digits gives 163646540.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091144 + ... + 4091183.

It is an arithmetic number, because the mean of its divisors is an integer number (28638148).

Almost surely, 2^163646540 is an apocalyptic number.

163646540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163646540 is an abundant number, since it is smaller than the sum of its proper divisors (180011236).

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

163646540 is a wasteful number, since it uses less digits than its factorization.

163646540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8182336 (or 8182334 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 163646540 is about 12792.4407366225. The cubic root of 163646540 is about 546.9768457502.

The spelling of 163646540 in words is "one hundred sixty-three million, six hundred forty-six thousand, five hundred forty".