1361777620729 has 2 divisors, whose sum is σ = 1361777620730. Its totient is φ = 1361777620728.

The previous prime is 1361777620661. The next prime is 1361777620771. The reversal of 1361777620729 is 9270267771631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1337550075625 + 24227545104 = 1156525^2 + 155652^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361777620729 - 2²⁵ = 1361744066297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361777620829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680888810364 + 680888810365.

It is an arithmetic number, because the mean of its divisors is an integer number (680888810365).

Almost surely, 2^{1361777620729} is an apocalyptic number.

It is an amenable number.

1361777620729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361777620729 is an equidigital number, since it uses as much as digits as its factorization.

1361777620729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9335088, while the sum is 58.

The spelling of 1361777620729 in words is "one trillion, three hundred sixty-one billion, seven hundred seventy-seven million, six hundred twenty thousand, seven hundred twenty-nine".