51378854333 has 4 divisors (see below), whose sum is σ = 54401139900. Its totient is φ = 48356568768.

The previous prime is 51378854327. The next prime is 51378854339. The reversal of 51378854333 is 33345887315.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (51378854327) and next prime (51378854339).

It can be written as a sum of positive squares in 2 ways, for example, as 40181405209 + 11197449124 = 200453^2 + 105818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51378854333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51378854339) 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, 1511142758 + ... + 1511142791.

It is an arithmetic number, because the mean of its divisors is an integer number (13600284975).

Almost surely, 2^51378854333 is an apocalyptic number.

It is an amenable number.

51378854333 is a deficient number, since it is larger than the sum of its proper divisors (3022285567).

51378854333 is a wasteful number, since it uses less digits than its factorization.

51378854333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022285566.

The product of its digits is 3628800, while the sum is 50.

The spelling of 51378854333 in words is "fifty-one billion, three hundred seventy-eight million, eight hundred fifty-four thousand, three hundred thirty-three".