53778235565 has 16 divisors (see below), whose sum is σ = 67352553216. Its totient is φ = 41144188800.

The previous prime is 53778235481. The next prime is 53778235573. The reversal of 53778235565 is 56553287735.

It is a happy number.

It is not a de Polignac number, because 53778235565 - 2²⁴ = 53761458349 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 53778235565.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 601145 + ... + 684785.

It is an arithmetic number, because the mean of its divisors is an integer number (4209534576).

Almost surely, 2^53778235565 is an apocalyptic number.

It is an amenable number.

53778235565 is a deficient number, since it is larger than the sum of its proper divisors (13574317651).

53778235565 is a wasteful number, since it uses less digits than its factorization.

53778235565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89260.

The product of its digits is 26460000, while the sum is 56.

The spelling of 53778235565 in words is "fifty-three billion, seven hundred seventy-eight million, two hundred thirty-five thousand, five hundred sixty-five".