128849520277 has 2 divisors, whose sum is σ = 128849520278. Its totient is φ = 128849520276.

The previous prime is 128849520259. The next prime is 128849520301. The reversal of 128849520277 is 772025948821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111742449841 + 17107070436 = 334279^2 + 130794^2 .

It is a cyclic number.

It is not a de Polignac number, because 128849520277 - 2²⁷ = 128715302549 is a prime.

It is a super-2 number, since 2×128849520277² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128849523277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64424760138 + 64424760139.

It is an arithmetic number, because the mean of its divisors is an integer number (64424760139).

Almost surely, 2^128849520277 is an apocalyptic number.

It is an amenable number.

128849520277 is a deficient number, since it is larger than the sum of its proper divisors (1).

128849520277 is an equidigital number, since it uses as much as digits as its factorization.

128849520277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4515840, while the sum is 55.

It can be divided in two parts, 12884 and 9520277, that added together give a triangular number (9533161 = T₄₃₆₆).

The spelling of 128849520277 in words is "one hundred twenty-eight billion, eight hundred forty-nine million, five hundred twenty thousand, two hundred seventy-seven".