2191964764304 has 80 divisors (see below), whose sum is σ = 5015394041856. Its totient is φ = 908168284800.

The previous prime is 2191964764217. The next prime is 2191964764387. The reversal of 2191964764304 is 4034674691912.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 2191964764304.

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, 3030989 + ... + 3683859.

Almost surely, 2^{2191964764304} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191964764304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2507697020928).

2191964764304 is an abundant number, since it is smaller than the sum of its proper divisors (2823429277552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191964764304 is a wasteful number, since it uses less digits than its factorization.

2191964764304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653884 (or 653878 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 56.

The spelling of 2191964764304 in words is "two trillion, one hundred ninety-one billion, nine hundred sixty-four million, seven hundred sixty-four thousand, three hundred four".