51638365201 has 2 divisors, whose sum is σ = 51638365202. Its totient is φ = 51638365200.

The previous prime is 51638365189. The next prime is 51638365231. The reversal of 51638365201 is 10256383615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48077140225 + 3561224976 = 219265^2 + 59676^2 .

It is a cyclic number.

It is not a de Polignac number, because 51638365201 - 2¹⁹ = 51637840913 is a prime.

It is not a weakly prime, because it can be changed into another prime (51638365231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25819182600 + 25819182601.

It is an arithmetic number, because the mean of its divisors is an integer number (25819182601).

Almost surely, 2^51638365201 is an apocalyptic number.

It is an amenable number.

51638365201 is a deficient number, since it is larger than the sum of its proper divisors (1).

51638365201 is an equidigital number, since it uses as much as digits as its factorization.

51638365201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 51638365201 in words is "fifty-one billion, six hundred thirty-eight million, three hundred sixty-five thousand, two hundred one".