51538775399 has 2 divisors, whose sum is σ = 51538775400. Its totient is φ = 51538775398.

The previous prime is 51538775369. The next prime is 51538775401. The reversal of 51538775399 is 99357783515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51538775399 - 2²⁸ = 51270339943 is a prime.

Together with 51538775401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51538775359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25769387699 + 25769387700.

It is an arithmetic number, because the mean of its divisors is an integer number (25769387700).

Almost surely, 2^51538775399 is an apocalyptic number.

51538775399 is a deficient number, since it is larger than the sum of its proper divisors (1).

51538775399 is an equidigital number, since it uses as much as digits as its factorization.

51538775399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721000, while the sum is 62.

The spelling of 51538775399 in words is "fifty-one billion, five hundred thirty-eight million, seven hundred seventy-five thousand, three hundred ninety-nine".