128511668077 has 8 divisors (see below), whose sum is σ = 140665988120. Its totient is φ = 116681463360.

The previous prime is 128511668063. The next prime is 128511668083. The reversal of 128511668077 is 770866115821.

It can be written as a sum of positive squares in 4 ways, for example, as 3442638276 + 125069029801 = 58674^2 + 353651^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128511668077 - 2²⁷ = 128377450349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128511668977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81028002 + ... + 81029587.

It is an arithmetic number, because the mean of its divisors is an integer number (17583248515).

Almost surely, 2^128511668077 is an apocalyptic number.

It is an amenable number.

128511668077 is a deficient number, since it is larger than the sum of its proper divisors (12154320043).

128511668077 is a wasteful number, since it uses less digits than its factorization.

128511668077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162057663.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 128511668077 in words is "one hundred twenty-eight billion, five hundred eleven million, six hundred sixty-eight thousand, seventy-seven".