51637968553 has 2 divisors, whose sum is σ = 51637968554. Its totient is φ = 51637968552.

The previous prime is 51637968533. The next prime is 51637968581. The reversal of 51637968553 is 35586973615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29195531689 + 22442436864 = 170867^2 + 149808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51637968553 is a prime.

It is not a weakly prime, because it can be changed into another prime (51637968533) 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, 25818984276 + 25818984277.

It is an arithmetic number, because the mean of its divisors is an integer number (25818984277).

Almost surely, 2^51637968553 is an apocalyptic number.

It is an amenable number.

51637968553 is a deficient number, since it is larger than the sum of its proper divisors (1).

51637968553 is an equidigital number, since it uses as much as digits as its factorization.

51637968553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412000, while the sum is 58.

The spelling of 51637968553 in words is "fifty-one billion, six hundred thirty-seven million, nine hundred sixty-eight thousand, five hundred fifty-three".