66444444541 has 2 divisors, whose sum is σ = 66444444542. Its totient is φ = 66444444540.

The previous prime is 66444444463. The next prime is 66444444553. The reversal of 66444444541 is 14544444466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43241538916 + 23202905625 = 207946^2 + 152325^2 .

It is a cyclic number.

It is not a de Polignac number, because 66444444541 - 2⁹ = 66444444029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66444444491 and 66444444500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66444444641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33222222270 + 33222222271.

It is an arithmetic number, because the mean of its divisors is an integer number (33222222271).

Almost surely, 2^66444444541 is an apocalyptic number.

It is an amenable number.

66444444541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66444444541 is an equidigital number, since it uses as much as digits as its factorization.

66444444541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2949120, while the sum is 46.

The spelling of 66444444541 in words is "sixty-six billion, four hundred forty-four million, four hundred forty-four thousand, five hundred forty-one".