51423121553 has 4 divisors (see below), whose sum is σ = 51430283760. Its totient is φ = 51415959348.

The previous prime is 51423121487. The next prime is 51423121583. The reversal of 51423121553 is 35512132415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35512132415 = 5 ⋅7102426483.

It is a cyclic number.

It is not a de Polignac number, because 51423121553 - 2²² = 51418927249 is a prime.

It is a super-3 number, since 3×51423121553³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51423121583) 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, 3570323 + ... + 3584696.

It is an arithmetic number, because the mean of its divisors is an integer number (12857570940).

Almost surely, 2^51423121553 is an apocalyptic number.

It is an amenable number.

51423121553 is a deficient number, since it is larger than the sum of its proper divisors (7162207).

51423121553 is an equidigital number, since it uses as much as digits as its factorization.

51423121553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7162206.

The product of its digits is 18000, while the sum is 32.

Adding to 51423121553 its reverse (35512132415), we get a palindrome (86935253968).

The spelling of 51423121553 in words is "fifty-one billion, four hundred twenty-three million, one hundred twenty-one thousand, five hundred fifty-three".