20555557011029 has 2 divisors, whose sum is σ = 20555557011030. Its totient is φ = 20555557011028.

The previous prime is 20555557011019. The next prime is 20555557011109. The reversal of 20555557011029 is 92011075555502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20405321700625 + 150235310404 = 4517225^2 + 387602^2 .

It is a cyclic number.

It is not a de Polignac number, because 20555557011029 - 2¹⁶ = 20555556945493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20555557011019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277778505514 + 10277778505515.

It is an arithmetic number, because the mean of its divisors is an integer number (10277778505515).

Almost surely, 2^{20555557011029} is an apocalyptic number.

It is an amenable number.

20555557011029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20555557011029 is an equidigital number, since it uses as much as digits as its factorization.

20555557011029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 787500, while the sum is 47.

The spelling of 20555557011029 in words is "twenty trillion, five hundred fifty-five billion, five hundred fifty-seven million, eleven thousand, twenty-nine".