54128657809 has 4 divisors (see below), whose sum is σ = 54324068404. Its totient is φ = 53933247216.

The previous prime is 54128657783. The next prime is 54128657839. The reversal of 54128657809 is 90875682145.

It is a happy number.

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 36978136209 + 17150521600 = 192297^2 + 130960^2 .

It is a cyclic number.

It is not a de Polignac number, because 54128657809 - 2²⁷ = 53994440081 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 54128657809.

It is not an unprimeable number, because it can be changed into a prime (54128657839) 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, 97704882 + ... + 97705435.

It is an arithmetic number, because the mean of its divisors is an integer number (13581017101).

Almost surely, 2^54128657809 is an apocalyptic number.

It is an amenable number.

54128657809 is a deficient number, since it is larger than the sum of its proper divisors (195410595).

54128657809 is a wasteful number, since it uses less digits than its factorization.

54128657809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195410594.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 54128657809 in words is "fifty-four billion, one hundred twenty-eight million, six hundred fifty-seven thousand, eight hundred nine".