51304243553 has 4 divisors (see below), whose sum is σ = 52145296788. Its totient is φ = 50463190320.

The previous prime is 51304243541. The next prime is 51304243579. The reversal of 51304243553 is 35534240315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6887838049 + 44416405504 = 82993^2 + 210752^2 .

It is a cyclic number.

It is not a de Polignac number, because 51304243553 - 2⁶ = 51304243489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51304243153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420526526 + ... + 420526647.

It is an arithmetic number, because the mean of its divisors is an integer number (13036324197).

Almost surely, 2^51304243553 is an apocalyptic number.

It is an amenable number.

51304243553 is a deficient number, since it is larger than the sum of its proper divisors (841053235).

51304243553 is an equidigital number, since it uses as much as digits as its factorization.

51304243553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841053234.

The product of its (nonzero) digits is 108000, while the sum is 35.

Adding to 51304243553 its reverse (35534240315), we get a palindrome (86838483868).

The spelling of 51304243553 in words is "fifty-one billion, three hundred four million, two hundred forty-three thousand, five hundred fifty-three".