26404600561 has 16 divisors (see below), whose sum is σ = 28936604800. Its totient is φ = 24005351808.

The previous prime is 26404600559. The next prime is 26404600567. The reversal of 26404600561 is 16500640462.

It is a cyclic number.

It is not a de Polignac number, because 26404600561 - 2¹ = 26404600559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26404600567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205941 + ... + 308578.

It is an arithmetic number, because the mean of its divisors is an integer number (1808537800).

Almost surely, 2^26404600561 is an apocalyptic number.

It is an amenable number.

26404600561 is a deficient number, since it is larger than the sum of its proper divisors (2532004239).

26404600561 is a wasteful number, since it uses less digits than its factorization.

26404600561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514648.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 26404600561 in words is "twenty-six billion, four hundred four million, six hundred thousand, five hundred sixty-one".