19776794129 has 2 divisors, whose sum is σ = 19776794130. Its totient is φ = 19776794128.

The previous prime is 19776794111. The next prime is 19776794231. The reversal of 19776794129 is 92149767791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17232600529 + 2544193600 = 131273^2 + 50440^2 .

It is a cyclic number.

It is not a de Polignac number, because 19776794129 - 2²⁰ = 19775745553 is a prime.

It is a super-2 number, since 2×19776794129² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19776794029) 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, 9888397064 + 9888397065.

It is an arithmetic number, because the mean of its divisors is an integer number (9888397065).

Almost surely, 2^19776794129 is an apocalyptic number.

It is an amenable number.

19776794129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19776794129 is an equidigital number, since it uses as much as digits as its factorization.

19776794129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12002256, while the sum is 62.

The spelling of 19776794129 in words is "nineteen billion, seven hundred seventy-six million, seven hundred ninety-four thousand, one hundred twenty-nine".