2161608812 has 12 divisors (see below), whose sum is σ = 4126707816. Its totient is φ = 982549440.

The previous prime is 2161608811. The next prime is 2161608859. The reversal of 2161608812 is 2188061612.

It is a super-2 number, since 2×2161608812² = 9345105312232102688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161608811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24563693 + ... + 24563780.

It is an arithmetic number, because the mean of its divisors is an integer number (343892318).

Almost surely, 2^2161608812 is an apocalyptic number.

2161608812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2161608812 is a deficient number, since it is larger than the sum of its proper divisors (1965099004).

2161608812 is a wasteful number, since it uses less digits than its factorization.

2161608812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49127488 (or 49127486 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 2161608812 is about 46493.1049941817. The cubic root of 2161608812 is about 1292.9816677416.

The spelling of 2161608812 in words is "two billion, one hundred sixty-one million, six hundred eight thousand, eight hundred twelve".