26731558561 has 8 divisors (see below), whose sum is σ = 27198243200. Its totient is φ = 26268081840.

The previous prime is 26731558559. The next prime is 26731558583. The reversal of 26731558561 is 16585513762.

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 26731558561 - 2¹ = 26731558559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26731508561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785166 + ... + 818503.

It is an arithmetic number, because the mean of its divisors is an integer number (3399780400).

Almost surely, 2^26731558561 is an apocalyptic number.

It is an amenable number.

26731558561 is a deficient number, since it is larger than the sum of its proper divisors (466684639).

26731558561 is a wasteful number, since it uses less digits than its factorization.

26731558561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603959.

The product of its digits is 1512000, while the sum is 49.

The spelling of 26731558561 in words is "twenty-six billion, seven hundred thirty-one million, five hundred fifty-eight thousand, five hundred sixty-one".