128998455541 has 4 divisors (see below), whose sum is σ = 129533719084. Its totient is φ = 128463192000.

The previous prime is 128998455533. The next prime is 128998455631. The reversal of 128998455541 is 145554899821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145554899821 = 89759 ⋅1621619.

It can be written as a sum of positive squares in 2 ways, for example, as 104684602500 + 24313853041 = 323550^2 + 155929^2 .

It is a cyclic number.

It is not a de Polignac number, because 128998455541 - 2³ = 128998455533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128998455541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128998453541) 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, 267631410 + ... + 267631891.

It is an arithmetic number, because the mean of its divisors is an integer number (32383429771).

Almost surely, 2^128998455541 is an apocalyptic number.

It is an amenable number.

128998455541 is a deficient number, since it is larger than the sum of its proper divisors (535263543).

128998455541 is an equidigital number, since it uses as much as digits as its factorization.

128998455541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535263542.

The product of its digits is 20736000, while the sum is 61.

The spelling of 128998455541 in words is "one hundred twenty-eight billion, nine hundred ninety-eight million, four hundred fifty-five thousand, five hundred forty-one".