128977683281 has 2 divisors, whose sum is σ = 128977683282. Its totient is φ = 128977683280.

The previous prime is 128977683271. The next prime is 128977683287. The reversal of 128977683281 is 182386779821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127907084881 + 1070598400 = 357641^2 + 32720^2 .

It is a cyclic number.

It is not a de Polignac number, because 128977683281 - 2¹⁴ = 128977666897 is a prime.

It is a super-2 number, since 2×128977683281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128977683287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64488841640 + 64488841641.

It is an arithmetic number, because the mean of its divisors is an integer number (64488841641).

Almost surely, 2^128977683281 is an apocalyptic number.

It is an amenable number.

128977683281 is a deficient number, since it is larger than the sum of its proper divisors (1).

128977683281 is an equidigital number, since it uses as much as digits as its factorization.

128977683281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 62.

The spelling of 128977683281 in words is "one hundred twenty-eight billion, nine hundred seventy-seven million, six hundred eighty-three thousand, two hundred eighty-one".