128977683409 has 2 divisors, whose sum is σ = 128977683410. Its totient is φ = 128977683408.

The previous prime is 128977683379. The next prime is 128977683427. The reversal of 128977683409 is 904386779821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93229462225 + 35748221184 = 305335^2 + 189072^2 .

It is a cyclic number.

It is not a de Polignac number, because 128977683409 - 2⁷ = 128977683281 is a prime.

It is a super-2 number, since 2×128977683409² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128977683449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64488841704 + 64488841705.

It is an arithmetic number, because the mean of its divisors is an integer number (64488841705).

Almost surely, 2^128977683409 is an apocalyptic number.

It is an amenable number.

128977683409 is a deficient number, since it is larger than the sum of its proper divisors (1).

128977683409 is an equidigital number, since it uses as much as digits as its factorization.

128977683409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 64.

The spelling of 128977683409 in words is "one hundred twenty-eight billion, nine hundred seventy-seven million, six hundred eighty-three thousand, four hundred nine".