2561681047529 has 8 divisors (see below), whose sum is σ = 2696969243040. Its totient is φ = 2426439139776.

The previous prime is 2561681047477. The next prime is 2561681047537. The reversal of 2561681047529 is 9257401861652.

2561681047529 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2561681047529 - 2²⁴ = 2561664270313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561681247529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11458304 + ... + 11679729.

It is an arithmetic number, because the mean of its divisors is an integer number (337121155380).

Almost surely, 2^{2561681047529} is an apocalyptic number.

It is an amenable number.

2561681047529 is a deficient number, since it is larger than the sum of its proper divisors (135288195511).

2561681047529 is a wasteful number, since it uses less digits than its factorization.

2561681047529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23143879.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 2561681047529 in words is "two trillion, five hundred sixty-one billion, six hundred eighty-one million, forty-seven thousand, five hundred twenty-nine".