66736707366661 has 2 divisors, whose sum is σ = 66736707366662. Its totient is φ = 66736707366660.

The previous prime is 66736707366653. The next prime is 66736707366751. The reversal of 66736707366661 is 16666370763766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66675488236036 + 61219130625 = 8165506^2 + 247425^2 .

It is a cyclic number.

It is not a de Polignac number, because 66736707366661 - 2³ = 66736707366653 is a prime.

It is a super-2 number, since 2×66736707366661² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66736707366631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368353683330 + 33368353683331.

It is an arithmetic number, because the mean of its divisors is an integer number (33368353683331).

Almost surely, 2^{66736707366661} is an apocalyptic number.

It is an amenable number.

66736707366661 is a deficient number, since it is larger than the sum of its proper divisors (1).

66736707366661 is an equidigital number, since it uses as much as digits as its factorization.

66736707366661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864162432, while the sum is 70.

The spelling of 66736707366661 in words is "sixty-six trillion, seven hundred thirty-six billion, seven hundred seven million, three hundred sixty-six thousand, six hundred sixty-one".