66737373740729 has 2 divisors, whose sum is σ = 66737373740730. Its totient is φ = 66737373740728.

The previous prime is 66737373740707. The next prime is 66737373740813. The reversal of 66737373740729 is 92704737373766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66394385475625 + 342988265104 = 8148275^2 + 585652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66737373740729 is a prime.

It is not a weakly prime, because it can be changed into another prime (66737373740929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368686870364 + 33368686870365.

It is an arithmetic number, because the mean of its divisors is an integer number (33368686870365).

Almost surely, 2^{66737373740729} is an apocalyptic number.

It is an amenable number.

66737373740729 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737373740729 is an equidigital number, since it uses as much as digits as its factorization.

66737373740729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176221088, while the sum is 71.

The spelling of 66737373740729 in words is "sixty-six trillion, seven hundred thirty-seven billion, three hundred seventy-three million, seven hundred forty thousand, seven hundred twenty-nine".