51551630323 has 4 divisors (see below), whose sum is σ = 51957548800. Its totient is φ = 51145711848.

The previous prime is 51551630321. The next prime is 51551630329. The reversal of 51551630323 is 32303615515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32303615515 = 5 ⋅6460723103.

It is a cyclic number.

It is not a de Polignac number, because 51551630323 - 2¹ = 51551630321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51551630321) 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, 202959048 + ... + 202959301.

It is an arithmetic number, because the mean of its divisors is an integer number (12989387200).

Almost surely, 2^51551630323 is an apocalyptic number.

51551630323 is a deficient number, since it is larger than the sum of its proper divisors (405918477).

51551630323 is a wasteful number, since it uses less digits than its factorization.

51551630323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405918476.

The product of its (nonzero) digits is 40500, while the sum is 34.

The spelling of 51551630323 in words is "fifty-one billion, five hundred fifty-one million, six hundred thirty thousand, three hundred twenty-three".