1206642609769 has 2 divisors, whose sum is σ = 1206642609770. Its totient is φ = 1206642609768.

The previous prime is 1206642609727. The next prime is 1206642609779. The reversal of 1206642609769 is 9679062466021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1094408899600 + 112233710169 = 1046140^2 + 335013^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206642609769 - 2²¹ = 1206640512617 is a prime.

It is a super-2 number, since 2×1206642609769² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1206642609719) 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, 603321304884 + 603321304885.

It is an arithmetic number, because the mean of its divisors is an integer number (603321304885).

Almost surely, 2^{1206642609769} is an apocalyptic number.

It is an amenable number.

1206642609769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206642609769 is an equidigital number, since it uses as much as digits as its factorization.

1206642609769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 1206642609769 in words is "one trillion, two hundred six billion, six hundred forty-two million, six hundred nine thousand, seven hundred sixty-nine".