53778438473 has 4 divisors (see below), whose sum is σ = 53789292420. Its totient is φ = 53767584528.

The previous prime is 53778438377. The next prime is 53778438479. The reversal of 53778438473 is 37483487735.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37483487735 = 5 ⋅7496697547.

It can be written as a sum of positive squares in 2 ways, for example, as 21742092304 + 32036346169 = 147452^2 + 178987^2 .

It is a cyclic number.

It is not a de Polignac number, because 53778438473 - 2²² = 53774244169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53778438479) 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, 5419538 + ... + 5429451.

It is an arithmetic number, because the mean of its divisors is an integer number (13447323105).

Almost surely, 2^53778438473 is an apocalyptic number.

It is an amenable number.

53778438473 is a deficient number, since it is larger than the sum of its proper divisors (10853947).

53778438473 is a wasteful number, since it uses less digits than its factorization.

53778438473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10853946.

The product of its digits is 47416320, while the sum is 59.

The spelling of 53778438473 in words is "fifty-three billion, seven hundred seventy-eight million, four hundred thirty-eight thousand, four hundred seventy-three".