26523432561 has 4 divisors (see below), whose sum is σ = 35364576752. Its totient is φ = 17682288372.

The previous prime is 26523432557. The next prime is 26523432563. The reversal of 26523432561 is 16523432562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26523432561 - 2² = 26523432557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26523432563) 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, 4420572091 + ... + 4420572096.

It is an arithmetic number, because the mean of its divisors is an integer number (8841144188).

Almost surely, 2^26523432561 is an apocalyptic number.

It is an amenable number.

26523432561 is a deficient number, since it is larger than the sum of its proper divisors (8841144191).

26523432561 is an equidigital number, since it uses as much as digits as its factorization.

26523432561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8841144190.

The product of its digits is 259200, while the sum is 39.

Subtracting from 26523432561 its reverse (16523432562), we obtain a palindrome (9999999999).

The spelling of 26523432561 in words is "twenty-six billion, five hundred twenty-three million, four hundred thirty-two thousand, five hundred sixty-one".