51299864501761 has 2 divisors, whose sum is σ = 51299864501762. Its totient is φ = 51299864501760.

The previous prime is 51299864501749. The next prime is 51299864501771. The reversal of 51299864501761 is 16710546899215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51288070541761 + 11793960000 = 7161569^2 + 108600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51299864501761 is a prime.

It is a super-2 number, since 2×51299864501761² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51299864501693 and 51299864501702.

It is not a weakly prime, because it can be changed into another prime (51299864501771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25649932250880 + 25649932250881.

It is an arithmetic number, because the mean of its divisors is an integer number (25649932250881).

Almost surely, 2^{51299864501761} is an apocalyptic number.

It is an amenable number.

51299864501761 is a deficient number, since it is larger than the sum of its proper divisors (1).

51299864501761 is an equidigital number, since it uses as much as digits as its factorization.

51299864501761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 51299864501761 in words is "fifty-one trillion, two hundred ninety-nine billion, eight hundred sixty-four million, five hundred one thousand, seven hundred sixty-one".