128205512597 has 4 divisors (see below), whose sum is σ = 135747013356. Its totient is φ = 120664011840.

The previous prime is 128205512587. The next prime is 128205512639. The reversal of 128205512597 is 795215502821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37874608996 + 90330903601 = 194614^2 + 300551^2 .

It is a cyclic number.

It is not a de Polignac number, because 128205512597 - 2²⁸ = 127937077141 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 (128205512527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3770750354 + ... + 3770750387.

It is an arithmetic number, because the mean of its divisors is an integer number (33936753339).

Almost surely, 2^128205512597 is an apocalyptic number.

128205512597 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128205512597 is a deficient number, since it is larger than the sum of its proper divisors (7541500759).

128205512597 is an equidigital number, since it uses as much as digits as its factorization.

128205512597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7541500758.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 128205512597 in words is "one hundred twenty-eight billion, two hundred five million, five hundred twelve thousand, five hundred ninety-seven".