66201623447 has 2 divisors, whose sum is σ = 66201623448. Its totient is φ = 66201623446.

The previous prime is 66201623417. The next prime is 66201623461. The reversal of 66201623447 is 74432610266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66201623447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66201623417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33100811723 + 33100811724.

It is an arithmetic number, because the mean of its divisors is an integer number (33100811724).

Almost surely, 2^66201623447 is an apocalyptic number.

66201623447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66201623447 is an equidigital number, since it uses as much as digits as its factorization.

66201623447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 66201623447 in words is "sixty-six billion, two hundred one million, six hundred twenty-three thousand, four hundred forty-seven".