51636778783 has 2 divisors, whose sum is σ = 51636778784. Its totient is φ = 51636778782.

The previous prime is 51636778759. The next prime is 51636778801. The reversal of 51636778783 is 38787763615.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51636778783 is a prime.

It is a super-2 number, since 2×51636778783² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51636778703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25818389391 + 25818389392.

It is an arithmetic number, because the mean of its divisors is an integer number (25818389392).

Almost surely, 2^51636778783 is an apocalyptic number.

51636778783 is a deficient number, since it is larger than the sum of its proper divisors (1).

51636778783 is an equidigital number, since it uses as much as digits as its factorization.

51636778783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35562240, while the sum is 61.

The spelling of 51636778783 in words is "fifty-one billion, six hundred thirty-six million, seven hundred seventy-eight thousand, seven hundred eighty-three".