128510955499 has 4 divisors (see below), whose sum is σ = 129220960960. Its totient is φ = 127800950040.

The previous prime is 128510955497. The next prime is 128510955571. The reversal of 128510955499 is 994559015821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128510955499 - 2¹ = 128510955497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128510955493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355002459 + ... + 355002820.

It is an arithmetic number, because the mean of its divisors is an integer number (32305240240).

Almost surely, 2^128510955499 is an apocalyptic number.

128510955499 is a deficient number, since it is larger than the sum of its proper divisors (710005461).

128510955499 is an equidigital number, since it uses as much as digits as its factorization.

128510955499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710005460.

The product of its (nonzero) digits is 5832000, while the sum is 58.

The spelling of 128510955499 in words is "one hundred twenty-eight billion, five hundred ten million, nine hundred fifty-five thousand, four hundred ninety-nine".