66541377523 has 2 divisors, whose sum is σ = 66541377524. Its totient is φ = 66541377522.

The previous prime is 66541377479. The next prime is 66541377527. The reversal of 66541377523 is 32577314566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66541377523 - 2²¹ = 66539280371 is a prime.

It is not a weakly prime, because it can be changed into another prime (66541377527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33270688761 + 33270688762.

It is an arithmetic number, because the mean of its divisors is an integer number (33270688762).

Almost surely, 2^66541377523 is an apocalyptic number.

66541377523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66541377523 is an equidigital number, since it uses as much as digits as its factorization.

66541377523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 49.

The spelling of 66541377523 in words is "sixty-six billion, five hundred forty-one million, three hundred seventy-seven thousand, five hundred twenty-three".