2161863264 has 48 divisors (see below), whose sum is σ = 6190793280. Its totient is φ = 655109760.

The previous prime is 2161863257. The next prime is 2161863271. The reversal of 2161863264 is 4623681612.

It is an interprime number because it is at equal distance from previous prime (2161863257) and next prime (2161863271).

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 a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1022554 + ... + 1024665.

It is an arithmetic number, because the mean of its divisors is an integer number (128974860).

Almost surely, 2^2161863264 is an apocalyptic number.

2161863264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2161863264 is an abundant number, since it is smaller than the sum of its proper divisors (4028930016).

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

2161863264 is a wasteful number, since it uses less digits than its factorization.

2161863264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047243 (or 2047235 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 2161863264 is about 46495.8413624272. The cubic root of 2161863264 is about 1293.0323998415.

The spelling of 2161863264 in words is "two billion, one hundred sixty-one million, eight hundred sixty-three thousand, two hundred sixty-four".