2161131466 has 16 divisors (see below), whose sum is σ = 3495630600. Its totient is φ = 996139008.

The previous prime is 2161131463. The next prime is 2161131491. The reversal of 2161131466 is 6641311612.

It can be written as a sum of positive squares in 4 ways, for example, as 1457025241 + 704106225 = 38171^2 + 26535^2 .

It is not an unprimeable number, because it can be changed into a prime (2161131463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34051 + ... + 74038.

Almost surely, 2^2161131466 is an apocalyptic number.

2161131466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2161131466 is a deficient number, since it is larger than the sum of its proper divisors (1334499134).

2161131466 is a wasteful number, since it uses less digits than its factorization.

2161131466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108873.

The product of its digits is 5184, while the sum is 31.

The square root of 2161131466 is about 46487.9711968591. The cubic root of 2161131466 is about 1292.8864847678.

The spelling of 2161131466 in words is "two billion, one hundred sixty-one million, one hundred thirty-one thousand, four hundred sixty-six".