51504447361 has 2 divisors, whose sum is σ = 51504447362. Its totient is φ = 51504447360.

The previous prime is 51504447349. The next prime is 51504447433. The reversal of 51504447361 is 16374440515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46723416336 + 4781031025 = 216156^2 + 69145^2 .

It is a cyclic number.

It is not a de Polignac number, because 51504447361 - 2⁵ = 51504447329 is a prime.

It is not a weakly prime, because it can be changed into another prime (51504447301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25752223680 + 25752223681.

It is an arithmetic number, because the mean of its divisors is an integer number (25752223681).

Almost surely, 2^51504447361 is an apocalyptic number.

It is an amenable number.

51504447361 is a deficient number, since it is larger than the sum of its proper divisors (1).

51504447361 is an equidigital number, since it uses as much as digits as its factorization.

51504447361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 40.

Adding to 51504447361 its reverse (16374440515), we get a palindrome (67878887876).

The spelling of 51504447361 in words is "fifty-one billion, five hundred four million, four hundred forty-seven thousand, three hundred sixty-one".