2564105128489 has 4 divisors (see below), whose sum is σ = 2564417489620. Its totient is φ = 2563792767360.

The previous prime is 2564105128423. The next prime is 2564105128493. The reversal of 2564105128489 is 9848215014652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1381377102400 + 1182728026089 = 1175320^2 + 1087533^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564105128489 - 2¹¹ = 2564105126441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564105128289) 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, 156168252 + ... + 156184669.

It is an arithmetic number, because the mean of its divisors is an integer number (641104372405).

Almost surely, 2^{2564105128489} is an apocalyptic number.

It is an amenable number.

2564105128489 is a deficient number, since it is larger than the sum of its proper divisors (312361131).

2564105128489 is an equidigital number, since it uses as much as digits as its factorization.

2564105128489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312361130.

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 2564105128489 in words is "two trillion, five hundred sixty-four billion, one hundred five million, one hundred twenty-eight thousand, four hundred eighty-nine".