1206642609779 has 2 divisors, whose sum is σ = 1206642609780. Its totient is φ = 1206642609778.

The previous prime is 1206642609769. The next prime is 1206642609793. The reversal of 1206642609779 is 9779062466021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206642609779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1206642609719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603321304889 + 603321304890.

It is an arithmetic number, because the mean of its divisors is an integer number (603321304890).

Almost surely, 2^{1206642609779} is an apocalyptic number.

1206642609779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206642609779 is an equidigital number, since it uses as much as digits as its factorization.

1206642609779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 59.

The spelling of 1206642609779 in words is "one trillion, two hundred six billion, six hundred forty-two million, six hundred nine thousand, seven hundred seventy-nine".