163649664 has 48 divisors (see below), whose sum is σ = 470922270. Its totient is φ = 54549504.

The previous prime is 163649663. The next prime is 163649671. The reversal of 163649664 is 466946361.

163649664 is a `hidden beast` number, since 1 + 636 + 4 + 9 + 6 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163635264 + 14400 = 12792^2 + 120^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (163649663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69877 + ... + 72180.

Almost surely, 2^163649664 is an apocalyptic number.

It is an amenable number.

163649664 is an abundant number, since it is smaller than the sum of its proper divisors (307272606).

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

163649664 is a wasteful number, since it uses less digits than its factorization.

163649664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142077 (or 142062 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 163649664 is about 12792.5628394001. The cubic root of 163649664 is about 546.9803263102.

The spelling of 163649664 in words is "one hundred sixty-three million, six hundred forty-nine thousand, six hundred sixty-four".