2168081396 has 18 divisors (see below), whose sum is σ = 4108451382. Its totient is φ = 1000652640.

The previous prime is 2168081387. The next prime is 2168081423. The reversal of 2168081396 is 6931808612.

It can be written as a sum of positive squares in 3 ways, for example, as 75933796 + 2092147600 = 8714^2 + 45740^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1602935 + ... + 1604286.

It is an arithmetic number, because the mean of its divisors is an integer number (228247299).

Almost surely, 2^2168081396 is an apocalyptic number.

2168081396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2168081396 is a deficient number, since it is larger than the sum of its proper divisors (1940369986).

2168081396 is a wasteful number, since it uses less digits than its factorization.

2168081396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207251 (or 3207236 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 2168081396 is about 46562.6609634802. The cubic root of 2168081396 is about 1294.2709224768.

The spelling of 2168081396 in words is "two billion, one hundred sixty-eight million, eighty-one thousand, three hundred ninety-six".