25660211060561 has 96 divisors (see below), whose sum is σ = 34961212342272. Its totient is φ = 18279657815040.

The previous prime is 25660211060513. The next prime is 25660211060567. The reversal of 25660211060561 is 16506011206652.

It is not a de Polignac number, because 25660211060561 - 2¹⁰ = 25660211059537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25660211060567) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 499754456 + ... + 499805798.

It is an arithmetic number, because the mean of its divisors is an integer number (364179295232).

Almost surely, 2^{25660211060561} is an apocalyptic number.

It is an amenable number.

25660211060561 is a deficient number, since it is larger than the sum of its proper divisors (9301001281711).

25660211060561 is a wasteful number, since it uses less digits than its factorization.

25660211060561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52039 (or 52022 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 25660211060561 in words is "twenty-five trillion, six hundred sixty billion, two hundred eleven million, sixty thousand, five hundred sixty-one".