2161063646 has 16 divisors (see below), whose sum is σ = 3746308320. Its totient is φ = 915763200.

The previous prime is 2161063637. The next prime is 2161063649. The reversal of 2161063646 is 6463601612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161063649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865955 + ... + 868446.

It is an arithmetic number, because the mean of its divisors is an integer number (234144270).

Almost surely, 2^2161063646 is an apocalyptic number.

2161063646 is a deficient number, since it is larger than the sum of its proper divisors (1585244674).

2161063646 is a wasteful number, since it uses less digits than its factorization.

2161063646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734499.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 2161063646 is about 46487.2417551311. The cubic root of 2161063646 is about 1292.8729602970.

The spelling of 2161063646 in words is "two billion, one hundred sixty-one million, sixty-three thousand, six hundred forty-six".