2161266168 has 64 divisors (see below), whose sum is σ = 5806460160. Its totient is φ = 667915776.

The previous prime is 2161266119. The next prime is 2161266197. The reversal of 2161266168 is 8616621612.

It is a happy number.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12196 + ... + 66867.

It is an arithmetic number, because the mean of its divisors is an integer number (90725940).

Almost surely, 2^2161266168 is an apocalyptic number.

It is an amenable number.

2161266168 is an abundant number, since it is smaller than the sum of its proper divisors (3645193992).

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

2161266168 is a wasteful number, since it uses less digits than its factorization.

2161266168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79156 (or 79152 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 2161266168 is about 46489.4199576635. The cubic root of 2161266168 is about 1292.9133458172.

The spelling of 2161266168 in words is "two billion, one hundred sixty-one million, two hundred sixty-six thousand, one hundred sixty-eight".