51438623215513 has 2 divisors, whose sum is σ = 51438623215514. Its totient is φ = 51438623215512.

The previous prime is 51438623215481. The next prime is 51438623215519. The reversal of 51438623215513 is 31551232683415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40746429523849 + 10692193691664 = 6383293^2 + 3269892^2 .

It is a cyclic number.

It is not a de Polignac number, because 51438623215513 - 2⁵ = 51438623215481 is a prime.

It is not a weakly prime, because it can be changed into another prime (51438623215519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25719311607756 + 25719311607757.

It is an arithmetic number, because the mean of its divisors is an integer number (25719311607757).

Almost surely, 2^{51438623215513} is an apocalyptic number.

It is an amenable number.

51438623215513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51438623215513 is an equidigital number, since it uses as much as digits as its factorization.

51438623215513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592000, while the sum is 49.

Adding to 51438623215513 its reverse (31551232683415), we get a palindrome (82989855898928).

The spelling of 51438623215513 in words is "fifty-one trillion, four hundred thirty-eight billion, six hundred twenty-three million, two hundred fifteen thousand, five hundred thirteen".