669334686433961 has 2 divisors, whose sum is σ = 669334686433962. Its totient is φ = 669334686433960.

The previous prime is 669334686433891. The next prime is 669334686433969. The reversal of 669334686433961 is 169334686433966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370091602195225 + 299243084238736 = 19237765^2 + 17298644^2 .

It is a cyclic number.

It is not a de Polignac number, because 669334686433961 - 2³⁰ = 669333612692137 is a prime.

It is not a weakly prime, because it can be changed into another prime (669334686433969) 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, 334667343216980 + 334667343216981.

It is an arithmetic number, because the mean of its divisors is an integer number (334667343216981).

Almost surely, 2^{669334686433961} is an apocalyptic number.

It is an amenable number.

669334686433961 is a deficient number, since it is larger than the sum of its proper divisors (1).

669334686433961 is an equidigital number, since it uses as much as digits as its factorization.

669334686433961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6530347008, while the sum is 77.

The spelling of 669334686433961 in words is "six hundred sixty-nine trillion, three hundred thirty-four billion, six hundred eighty-six million, four hundred thirty-three thousand, nine hundred sixty-one".