128643131377 has 2 divisors, whose sum is σ = 128643131378. Its totient is φ = 128643131376.

The previous prime is 128643131339. The next prime is 128643131417. The reversal of 128643131377 is 773131346821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103999155121 + 24643976256 = 322489^2 + 156984^2 .

It is a cyclic number.

It is not a de Polignac number, because 128643131377 - 2¹⁵ = 128643098609 is a prime.

It is a super-2 number, since 2×128643131377² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128643131327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64321565688 + 64321565689.

It is an arithmetic number, because the mean of its divisors is an integer number (64321565689).

Almost surely, 2^128643131377 is an apocalyptic number.

It is an amenable number.

128643131377 is a deficient number, since it is larger than the sum of its proper divisors (1).

128643131377 is an equidigital number, since it uses as much as digits as its factorization.

128643131377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The spelling of 128643131377 in words is "one hundred twenty-eight billion, six hundred forty-three million, one hundred thirty-one thousand, three hundred seventy-seven".