51637968533 has 2 divisors, whose sum is σ = 51637968534. Its totient is φ = 51637968532.

The previous prime is 51637968467. The next prime is 51637968553. The reversal of 51637968533 is 33586973615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43688106289 + 7949862244 = 209017^2 + 89162^2 .

It is a cyclic number.

It is not a de Polignac number, because 51637968533 - 2³⁴ = 34458099349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51637968553) 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 as a sum of consecutive naturals, namely, 25818984266 + 25818984267.

It is an arithmetic number, because the mean of its divisors is an integer number (25818984267).

Almost surely, 2^51637968533 is an apocalyptic number.

It is an amenable number.

51637968533 is a deficient number, since it is larger than the sum of its proper divisors (1).

51637968533 is an equidigital number, since it uses as much as digits as its factorization.

51637968533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12247200, while the sum is 56.

The spelling of 51637968533 in words is "fifty-one billion, six hundred thirty-seven million, nine hundred sixty-eight thousand, five hundred thirty-three".