26204240261 has 4 divisors (see below), whose sum is σ = 26205568992. Its totient is φ = 26202911532.

The previous prime is 26204240243. The next prime is 26204240303. The reversal of 26204240261 is 16204240262.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26204240261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26204245261) 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, 634331 + ... + 674376.

It is an arithmetic number, because the mean of its divisors is an integer number (6551392248).

Almost surely, 2^26204240261 is an apocalyptic number.

It is an amenable number.

26204240261 is a deficient number, since it is larger than the sum of its proper divisors (1328731).

26204240261 is a wasteful number, since it uses less digits than its factorization.

26204240261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328730.

The product of its (nonzero) digits is 9216, while the sum is 29.

Subtracting from 26204240261 its reverse (16204240262), we obtain a palindrome (9999999999).

The spelling of 26204240261 in words is "twenty-six billion, two hundred four million, two hundred forty thousand, two hundred sixty-one".