19999256120029 has 2 divisors, whose sum is σ = 19999256120030. Its totient is φ = 19999256120028.

The previous prime is 19999256119967. The next prime is 19999256120069. The reversal of 19999256120029 is 92002165299991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13697660071225 + 6301596048804 = 3701035^2 + 2510298^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999256120029 - 2²¹ = 19999254022877 is a prime.

It is a super-2 number, since 2×19999256120029² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999256120069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999628060014 + 9999628060015.

It is an arithmetic number, because the mean of its divisors is an integer number (9999628060015).

Almost surely, 2^{19999256120029} is an apocalyptic number.

It is an amenable number.

19999256120029 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999256120029 is an equidigital number, since it uses as much as digits as its factorization.

19999256120029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14171760, while the sum is 64.

The spelling of 19999256120029 in words is "nineteen trillion, nine hundred ninety-nine billion, two hundred fifty-six million, one hundred twenty thousand, twenty-nine".