53661337553 has 4 divisors (see below), whose sum is σ = 54264274020. Its totient is φ = 53058401088.

The previous prime is 53661337547. The next prime is 53661337567. The reversal of 53661337553 is 35573316635.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35573316635 = 5 ⋅7114663327.

It can be written as a sum of positive squares in 2 ways, for example, as 35301900544 + 18359437009 = 187888^2 + 135497^2 .

It is a cyclic number.

It is not a de Polignac number, because 53661337553 - 2⁸ = 53661337297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53661337498 and 53661337507.

It is not an unprimeable number, because it can be changed into a prime (53661337453) 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, 301468100 + ... + 301468277.

It is an arithmetic number, because the mean of its divisors is an integer number (13566068505).

Almost surely, 2^53661337553 is an apocalyptic number.

It is an amenable number.

53661337553 is a deficient number, since it is larger than the sum of its proper divisors (602936467).

53661337553 is an equidigital number, since it uses as much as digits as its factorization.

53661337553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602936466.

The product of its digits is 2551500, while the sum is 47.

The spelling of 53661337553 in words is "fifty-three billion, six hundred sixty-one million, three hundred thirty-seven thousand, five hundred fifty-three".