66122704729 has 2 divisors, whose sum is σ = 66122704730. Its totient is φ = 66122704728.

The previous prime is 66122704709. The next prime is 66122704751. The reversal of 66122704729 is 92740722166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47421595225 + 18701109504 = 217765^2 + 136752^2 .

It is a cyclic number.

It is not a de Polignac number, because 66122704729 - 2³³ = 57532770137 is a prime.

It is not a weakly prime, because it can be changed into another prime (66122704709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33061352364 + 33061352365.

It is an arithmetic number, because the mean of its divisors is an integer number (33061352365).

Almost surely, 2^66122704729 is an apocalyptic number.

It is an amenable number.

66122704729 is a deficient number, since it is larger than the sum of its proper divisors (1).

66122704729 is an equidigital number, since it uses as much as digits as its factorization.

66122704729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 66122704729 in words is "sixty-six billion, one hundred twenty-two million, seven hundred four thousand, seven hundred twenty-nine".