2128524226561 has 4 divisors (see below), whose sum is σ = 2128673286724. Its totient is φ = 2128375166400.

The previous prime is 2128524226537. The next prime is 2128524226583. The reversal of 2128524226561 is 1656224258212.

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 584330292225 + 1544193934336 = 764415^2 + 1242656^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128524226561 - 2⁵ = 2128524226529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128524227561) 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, 74508660 + ... + 74537221.

It is an arithmetic number, because the mean of its divisors is an integer number (532168321681).

Almost surely, 2^{2128524226561} is an apocalyptic number.

It is an amenable number.

2128524226561 is a deficient number, since it is larger than the sum of its proper divisors (149060163).

2128524226561 is a wasteful number, since it uses less digits than its factorization.

2128524226561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149060162.

The product of its digits is 921600, while the sum is 46.

The spelling of 2128524226561 in words is "two trillion, one hundred twenty-eight billion, five hundred twenty-four million, two hundred twenty-six thousand, five hundred sixty-one".