128396081477 has 4 divisors (see below), whose sum is σ = 128477811936. Its totient is φ = 128314351020.

The previous prime is 128396081467. The next prime is 128396081479. The reversal of 128396081477 is 774180693821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 774180693821 = 17 ⋅45540040813.

It is a cyclic number.

It is not a de Polignac number, because 128396081477 - 2⁸ = 128396081221 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 (128396081479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40862873 + ... + 40866014.

It is an arithmetic number, because the mean of its divisors is an integer number (32119452984).

Almost surely, 2^128396081477 is an apocalyptic number.

It is an amenable number.

128396081477 is a deficient number, since it is larger than the sum of its proper divisors (81730459).

128396081477 is an equidigital number, since it uses as much as digits as its factorization.

128396081477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81730458.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 128396081477 in words is "one hundred twenty-eight billion, three hundred ninety-six million, eighty-one thousand, four hundred seventy-seven".