20562296978129 has 2 divisors, whose sum is σ = 20562296978130. Its totient is φ = 20562296978128.

The previous prime is 20562296978063. The next prime is 20562296978219. The reversal of 20562296978129 is 92187969226502.

Together with next prime (20562296978219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18479681440000 + 2082615538129 = 4298800^2 + 1443127^2 .

It is a cyclic number.

It is not a de Polignac number, because 20562296978129 - 2¹⁶ = 20562296912593 is a prime.

It is not a weakly prime, because it can be changed into another prime (20562296978429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281148489064 + 10281148489065.

It is an arithmetic number, because the mean of its divisors is an integer number (10281148489065).

Almost surely, 2^{20562296978129} is an apocalyptic number.

It is an amenable number.

20562296978129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20562296978129 is an equidigital number, since it uses as much as digits as its factorization.

20562296978129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117573120, while the sum is 68.

The spelling of 20562296978129 in words is "twenty trillion, five hundred sixty-two billion, two hundred ninety-six million, nine hundred seventy-eight thousand, one hundred twenty-nine".