66201623959 has 2 divisors, whose sum is σ = 66201623960. Its totient is φ = 66201623958.

The previous prime is 66201623869. The next prime is 66201623963. The reversal of 66201623959 is 95932610266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66201623959 - 2⁹ = 66201623447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66201623759) 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, 33100811979 + 33100811980.

It is an arithmetic number, because the mean of its divisors is an integer number (33100811980).

Almost surely, 2^66201623959 is an apocalyptic number.

66201623959 is a deficient number, since it is larger than the sum of its proper divisors (1).

66201623959 is an equidigital number, since it uses as much as digits as its factorization.

66201623959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The spelling of 66201623959 in words is "sixty-six billion, two hundred one million, six hundred twenty-three thousand, nine hundred fifty-nine".