2191237966 has 16 divisors (see below), whose sum is σ = 3460842000. Its totient is φ = 1037657088.

The previous prime is 2191237957. The next prime is 2191237973. The reversal of 2191237966 is 6697321912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183960 + ... + 195508.

It is an arithmetic number, because the mean of its divisors is an integer number (216302625).

Almost surely, 2^2191237966 is an apocalyptic number.

2191237966 is a deficient number, since it is larger than the sum of its proper divisors (1269604034).

2191237966 is a wasteful number, since it uses less digits than its factorization.

2191237966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16563.

The product of its digits is 244944, while the sum is 46.

The square root of 2191237966 is about 46810.6608156732. The cubic root of 2191237966 is about 1298.8625091358.

The spelling of 2191237966 in words is "two billion, one hundred ninety-one million, two hundred thirty-seven thousand, nine hundred sixty-six".