2163681064 has 16 divisors (see below), whose sum is σ = 4064116320. Its totient is φ = 1079916720.

The previous prime is 2163681011. The next prime is 2163681067. The reversal of 2163681064 is 4601863612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2163681067) 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, 235692 + ... + 244699.

It is an arithmetic number, because the mean of its divisors is an integer number (254007270).

Almost surely, 2^2163681064 is an apocalyptic number.

It is an amenable number.

2163681064 is a deficient number, since it is larger than the sum of its proper divisors (1900435256).

2163681064 is a wasteful number, since it uses less digits than its factorization.

2163681064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480960 (or 480956 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 2163681064 is about 46515.3852397247. The cubic root of 2163681064 is about 1293.3947131980.

The spelling of 2163681064 in words is "two billion, one hundred sixty-three million, six hundred eighty-one thousand, sixty-four".