51399208801 has 2 divisors, whose sum is σ = 51399208802. Its totient is φ = 51399208800.

The previous prime is 51399208793. The next prime is 51399208837. The reversal of 51399208801 is 10880299315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48663918801 + 2735290000 = 220599^2 + 52300^2 .

It is a cyclic number.

It is not a de Polignac number, because 51399208801 - 2³ = 51399208793 is a prime.

It is not a weakly prime, because it can be changed into another prime (51399208001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699604400 + 25699604401.

It is an arithmetic number, because the mean of its divisors is an integer number (25699604401).

Almost surely, 2^51399208801 is an apocalyptic number.

It is an amenable number.

51399208801 is a deficient number, since it is larger than the sum of its proper divisors (1).

51399208801 is an equidigital number, since it uses as much as digits as its factorization.

51399208801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 51399208801 in words is "fifty-one billion, three hundred ninety-nine million, two hundred eight thousand, eight hundred one".