51635204066549 has 2 divisors, whose sum is σ = 51635204066550. Its totient is φ = 51635204066548.

The previous prime is 51635204066521. The next prime is 51635204066659. The reversal of 51635204066549 is 94566040253615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51327337776100 + 307866290449 = 7164310^2 + 554857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51635204066549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51635204066494 and 51635204066503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51635204066519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25817602033274 + 25817602033275.

It is an arithmetic number, because the mean of its divisors is an integer number (25817602033275).

Almost surely, 2^{51635204066549} is an apocalyptic number.

It is an amenable number.

51635204066549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51635204066549 is an equidigital number, since it uses as much as digits as its factorization.

51635204066549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328000, while the sum is 56.

The spelling of 51635204066549 in words is "fifty-one trillion, six hundred thirty-five billion, two hundred four million, sixty-six thousand, five hundred forty-nine".