2191964764305 has 32 divisors (see below), whose sum is σ = 3530480052096. Its totient is φ = 1161286815744.

The previous prime is 2191964764217. The next prime is 2191964764387. The reversal of 2191964764305 is 5034674691912.

It is not a de Polignac number, because 2191964764305 - 2⁷ = 2191964764177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1422999 + ... + 2531571.

It is an arithmetic number, because the mean of its divisors is an integer number (110327501628).

Almost surely, 2^{2191964764305} is an apocalyptic number.

It is an amenable number.

2191964764305 is a deficient number, since it is larger than the sum of its proper divisors (1338515287791).

2191964764305 is a wasteful number, since it uses less digits than its factorization.

2191964764305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109457.

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 2191964764305 in words is "two trillion, one hundred ninety-one billion, nine hundred sixty-four million, seven hundred sixty-four thousand, three hundred five".