51203778853 has 4 divisors (see below), whose sum is σ = 51212794528. Its totient is φ = 51194763180.

The previous prime is 51203778839. The next prime is 51203778877. The reversal of 51203778853 is 35887730215.

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: 35887730215 = 5 ⋅7177546043.

It is a cyclic number.

It is not a de Polignac number, because 51203778853 - 2²⁵ = 51170224421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51203778797 and 51203778806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51203778553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4499313 + ... + 4510678.

It is an arithmetic number, because the mean of its divisors is an integer number (12803198632).

Almost surely, 2^51203778853 is an apocalyptic number.

It is an amenable number.

51203778853 is a deficient number, since it is larger than the sum of its proper divisors (9015675).

51203778853 is an equidigital number, since it uses as much as digits as its factorization.

51203778853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9015674.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 51203778853 in words is "fifty-one billion, two hundred three million, seven hundred seventy-eight thousand, eight hundred fifty-three".