2780864194447 has 4 divisors (see below), whose sum is σ = 2901771333360. Its totient is φ = 2659957055536.

The previous prime is 2780864194421. The next prime is 2780864194469. The reversal of 2780864194447 is 7444914680872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780864194447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780864194487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60453569422 + ... + 60453569467.

It is an arithmetic number, because the mean of its divisors is an integer number (725442833340).

Almost surely, 2^{2780864194447} is an apocalyptic number.

2780864194447 is a deficient number, since it is larger than the sum of its proper divisors (120907138913).

2780864194447 is a wasteful number, since it uses less digits than its factorization.

2780864194447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120907138912.

The product of its (nonzero) digits is 86704128, while the sum is 64.

The spelling of 2780864194447 in words is "two trillion, seven hundred eighty billion, eight hundred sixty-four million, one hundred ninety-four thousand, four hundred forty-seven".