66354354869497 has 2 divisors, whose sum is σ = 66354354869498. Its totient is φ = 66354354869496.

The previous prime is 66354354869459. The next prime is 66354354869519. The reversal of 66354354869497 is 79496845345366.

66354354869497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60697016507241 + 5657338362256 = 7790829^2 + 2378516^2 .

It is a cyclic number.

It is not a de Polignac number, because 66354354869497 - 2²⁷ = 66354220651769 is a prime.

It is not a weakly prime, because it can be changed into another prime (66354354869897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33177177434748 + 33177177434749.

It is an arithmetic number, because the mean of its divisors is an integer number (33177177434749).

Almost surely, 2^{66354354869497} is an apocalyptic number.

It is an amenable number.

66354354869497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66354354869497 is an equidigital number, since it uses as much as digits as its factorization.

66354354869497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14108774400, while the sum is 79.

The spelling of 66354354869497 in words is "sixty-six trillion, three hundred fifty-four billion, three hundred fifty-four million, eight hundred sixty-nine thousand, four hundred ninety-seven".