128200420081 has 2 divisors, whose sum is σ = 128200420082. Its totient is φ = 128200420080.

The previous prime is 128200420079. The next prime is 128200420133. The reversal of 128200420081 is 180024002821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126946127025 + 1254293056 = 356295^2 + 35416^2 .

It is a cyclic number.

It is not a de Polignac number, because 128200420081 - 2¹ = 128200420079 is a prime.

It is a super-2 number, since 2×128200420081² (a number of 23 digits) contains 22 as substring.

Together with 128200420079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128200420781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64100210040 + 64100210041.

It is an arithmetic number, because the mean of its divisors is an integer number (64100210041).

Almost surely, 2^128200420081 is an apocalyptic number.

It is an amenable number.

128200420081 is a deficient number, since it is larger than the sum of its proper divisors (1).

128200420081 is an equidigital number, since it uses as much as digits as its factorization.

128200420081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 28.

The spelling of 128200420081 in words is "one hundred twenty-eight billion, two hundred million, four hundred twenty thousand, eighty-one".