26225611661 has 4 divisors (see below), whose sum is σ = 26231970432. Its totient is φ = 26219252892.

The previous prime is 26225611627. The next prime is 26225611681. The reversal of 26225611661 is 16611652262.

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 not a de Polignac number, because 26225611661 - 2¹⁸ = 26225349517 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 (26225611681) 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 3 ways as a sum of consecutive naturals, for example, 3173195 + ... + 3181448.

It is an arithmetic number, because the mean of its divisors is an integer number (6557992608).

Almost surely, 2^26225611661 is an apocalyptic number.

It is an amenable number.

26225611661 is a deficient number, since it is larger than the sum of its proper divisors (6358771).

26225611661 is an equidigital number, since it uses as much as digits as its factorization.

26225611661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6358770.

The product of its digits is 51840, while the sum is 38.

The spelling of 26225611661 in words is "twenty-six billion, two hundred twenty-five million, six hundred eleven thousand, six hundred sixty-one".