53320311565 has 8 divisors (see below), whose sum is σ = 63986310648. Its totient is φ = 42654958080.

The previous prime is 53320311491. The next prime is 53320311593. The reversal of 53320311565 is 56511302335.

It can be written as a sum of positive squares in 4 ways, for example, as 233386729 + 53086924836 = 15277^2 + 230406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53320311565 - 2¹³ = 53320303373 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 53320311565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44089 + ... + 329521.

It is an arithmetic number, because the mean of its divisors is an integer number (7998288831).

Almost surely, 2^53320311565 is an apocalyptic number.

It is an amenable number.

53320311565 is a deficient number, since it is larger than the sum of its proper divisors (10665999083).

53320311565 is a wasteful number, since it uses less digits than its factorization.

53320311565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322799.

The product of its (nonzero) digits is 40500, while the sum is 34.

The spelling of 53320311565 in words is "fifty-three billion, three hundred twenty million, three hundred eleven thousand, five hundred sixty-five".