26433537661 has 4 divisors (see below), whose sum is σ = 26517990172. Its totient is φ = 26349085152.

The previous prime is 26433537659. The next prime is 26433537673. The reversal of 26433537661 is 16673533462.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5057343225 + 21376194436 = 71115^2 + 146206^2 .

It is a cyclic number.

It is not a de Polignac number, because 26433537661 - 2¹ = 26433537659 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 (26433547661) 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, 42225786 + ... + 42226411.

It is an arithmetic number, because the mean of its divisors is an integer number (6629497543).

Almost surely, 2^26433537661 is an apocalyptic number.

It is an amenable number.

26433537661 is a deficient number, since it is larger than the sum of its proper divisors (84452511).

26433537661 is an equidigital number, since it uses as much as digits as its factorization.

26433537661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84452510.

The product of its digits is 1632960, while the sum is 46.

The spelling of 26433537661 in words is "twenty-six billion, four hundred thirty-three million, five hundred thirty-seven thousand, six hundred sixty-one".