66796479709 has 2 divisors, whose sum is σ = 66796479710. Its totient is φ = 66796479708.

The previous prime is 66796479703. The next prime is 66796479749. The reversal of 66796479709 is 90797469766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41696414809 + 25100064900 = 204197^2 + 158430^2 .

It is a cyclic number.

It is not a de Polignac number, because 66796479709 - 2¹⁷ = 66796348637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66796479703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33398239854 + 33398239855.

It is an arithmetic number, because the mean of its divisors is an integer number (33398239855).

Almost surely, 2^66796479709 is an apocalyptic number.

It is an amenable number.

66796479709 is a deficient number, since it is larger than the sum of its proper divisors (1).

66796479709 is an equidigital number, since it uses as much as digits as its factorization.

66796479709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216040608, while the sum is 70.

The spelling of 66796479709 in words is "sixty-six billion, seven hundred ninety-six million, four hundred seventy-nine thousand, seven hundred nine".