66501957559 has 2 divisors, whose sum is σ = 66501957560. Its totient is φ = 66501957558.

The previous prime is 66501957539. The next prime is 66501957607. The reversal of 66501957559 is 95575910566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66501957559 - 2⁹ = 66501957047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66501957539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250978779 + 33250978780.

It is an arithmetic number, because the mean of its divisors is an integer number (33250978780).

Almost surely, 2^66501957559 is an apocalyptic number.

66501957559 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501957559 is an equidigital number, since it uses as much as digits as its factorization.

66501957559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12757500, while the sum is 58.

The spelling of 66501957559 in words is "sixty-six billion, five hundred one million, nine hundred fifty-seven thousand, five hundred fifty-nine".