2561681047530 has 32 divisors (see below), whose sum is σ = 6706946743488. Its totient is φ = 621013587200.

The previous prime is 2561681047477. The next prime is 2561681047537. The reversal of 2561681047530 is 357401861652.

It is a self number, because there is not a number n which added to its sum of digits gives 2561681047530.

It is not an unprimeable number, because it can be changed into a prime (2561681047537) 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, 3881334591 + ... + 3881335250.

It is an arithmetic number, because the mean of its divisors is an integer number (209592085734).

Almost surely, 2^{2561681047530} is an apocalyptic number.

2561681047530 is an abundant number, since it is smaller than the sum of its proper divisors (4145265695958).

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

2561681047530 is a wasteful number, since it uses less digits than its factorization.

2561681047530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7762669862.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 2561681047530 in words is "two trillion, five hundred sixty-one billion, six hundred eighty-one million, forty-seven thousand, five hundred thirty".