66251735441 has 4 divisors (see below), whose sum is σ = 66258560484. Its totient is φ = 66244910400.

The previous prime is 66251735437. The next prime is 66251735443. The reversal of 66251735441 is 14453715266.

66251735441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 24749897041 + 41501838400 = 157321^2 + 203720^2 .

It is a cyclic number.

It is not a de Polignac number, because 66251735441 - 2² = 66251735437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66251735392 and 66251735401.

It is not an unprimeable number, because it can be changed into a prime (66251735443) 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, 3397940 + ... + 3417381.

It is an arithmetic number, because the mean of its divisors is an integer number (16564640121).

Almost surely, 2^66251735441 is an apocalyptic number.

It is an amenable number.

66251735441 is a deficient number, since it is larger than the sum of its proper divisors (6825043).

66251735441 is an equidigital number, since it uses as much as digits as its factorization.

66251735441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6825042.

The product of its digits is 604800, while the sum is 44.

The spelling of 66251735441 in words is "sixty-six billion, two hundred fifty-one million, seven hundred thirty-five thousand, four hundred forty-one".