2161816426 has 32 divisors (see below), whose sum is σ = 4182295680. Its totient is φ = 813220800.

The previous prime is 2161816387. The next prime is 2161816451. The reversal of 2161816426 is 6246181612.

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, 237565 + ... + 246496.

It is an arithmetic number, because the mean of its divisors is an integer number (130696740).

Almost surely, 2^2161816426 is an apocalyptic number.

2161816426 is a deficient number, since it is larger than the sum of its proper divisors (2020479254).

2161816426 is a wasteful number, since it uses less digits than its factorization.

2161816426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484110.

The product of its digits is 27648, while the sum is 37.

The square root of 2161816426 is about 46495.3376802449. The cubic root of 2161816426 is about 1293.0230616794.

The spelling of 2161816426 in words is "two billion, one hundred sixty-one million, eight hundred sixteen thousand, four hundred twenty-six".