51638687827 has 2 divisors, whose sum is σ = 51638687828. Its totient is φ = 51638687826.

The previous prime is 51638687801. The next prime is 51638687833. The reversal of 51638687827 is 72878683615.

51638687827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51638687827 - 2¹¹ = 51638685779 is a prime.

It is not a weakly prime, because it can be changed into another prime (51638687857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25819343913 + 25819343914.

It is an arithmetic number, because the mean of its divisors is an integer number (25819343914).

Almost surely, 2^51638687827 is an apocalyptic number.

51638687827 is a deficient number, since it is larger than the sum of its proper divisors (1).

51638687827 is an equidigital number, since it uses as much as digits as its factorization.

51638687827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27095040, while the sum is 61.

The spelling of 51638687827 in words is "fifty-one billion, six hundred thirty-eight million, six hundred eighty-seven thousand, eight hundred twenty-seven".