1200181791779 has 2 divisors, whose sum is σ = 1200181791780. Its totient is φ = 1200181791778.

The previous prime is 1200181791773. The next prime is 1200181791791. The reversal of 1200181791779 is 9771971810021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200181791779 - 2⁴ = 1200181791763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200181791779.

It is not a weakly prime, because it can be changed into another prime (1200181791773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600090895889 + 600090895890.

It is an arithmetic number, because the mean of its divisors is an integer number (600090895890).

Almost surely, 2^{1200181791779} is an apocalyptic number.

1200181791779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200181791779 is an equidigital number, since it uses as much as digits as its factorization.

1200181791779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 53.

The spelling of 1200181791779 in words is "one trillion, two hundred billion, one hundred eighty-one million, seven hundred ninety-one thousand, seven hundred seventy-nine".