2561784776947 has 16 divisors (see below), whose sum is σ = 2798122844160. Its totient is φ = 2326022647200.

The previous prime is 2561784776909. The next prime is 2561784776953. The reversal of 2561784776947 is 7496774871652.

It is a cyclic number.

It is not a de Polignac number, because 2561784776947 - 2¹⁹ = 2561784252659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2561784776947.

It is not an unprimeable number, because it can be changed into a prime (2561784776977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47626254 + ... + 47680012.

It is an arithmetic number, because the mean of its divisors is an integer number (174882677760).

Almost surely, 2^{2561784776947} is an apocalyptic number.

2561784776947 is a deficient number, since it is larger than the sum of its proper divisors (236338067213).

2561784776947 is a wasteful number, since it uses less digits than its factorization.

2561784776947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59034.

The product of its digits is 995742720, while the sum is 73.

The spelling of 2561784776947 in words is "two trillion, five hundred sixty-one billion, seven hundred eighty-four million, seven hundred seventy-six thousand, nine hundred forty-seven".