66737473669 has 2 divisors, whose sum is σ = 66737473670. Its totient is φ = 66737473668.

The previous prime is 66737473657. The next prime is 66737473679. The reversal of 66737473669 is 96637473766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66724056100 + 13417569 = 258310^2 + 3663^2 .

It is a cyclic number.

It is not a de Polignac number, because 66737473669 - 2⁷ = 66737473541 is a prime.

It is a super-2 number, since 2×66737473669² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66737473669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66737473679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368736834 + 33368736835.

It is an arithmetic number, because the mean of its divisors is an integer number (33368736835).

Almost surely, 2^66737473669 is an apocalyptic number.

It is an amenable number.

66737473669 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737473669 is an equidigital number, since it uses as much as digits as its factorization.

66737473669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144027072, while the sum is 64.

The spelling of 66737473669 in words is "sixty-six billion, seven hundred thirty-seven million, four hundred seventy-three thousand, six hundred sixty-nine".