51399112478801 has 2 divisors, whose sum is σ = 51399112478802. Its totient is φ = 51399112478800.

The previous prime is 51399112478759. The next prime is 51399112478843. The reversal of 51399112478801 is 10887421199315.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (51399112478759) and next prime (51399112478843).

It can be written as a sum of positive squares in only one way, i.e., 47194976419600 + 4204136059201 = 6869860^2 + 2050399^2 .

It is a cyclic number.

It is not a de Polignac number, because 51399112478801 - 2⁶ = 51399112478737 is a prime.

It is not a weakly prime, because it can be changed into another prime (51399112478881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699556239400 + 25699556239401.

It is an arithmetic number, because the mean of its divisors is an integer number (25699556239401).

Almost surely, 2^{51399112478801} is an apocalyptic number.

It is an amenable number.

51399112478801 is a deficient number, since it is larger than the sum of its proper divisors (1).

51399112478801 is an equidigital number, since it uses as much as digits as its factorization.

51399112478801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 59.

The spelling of 51399112478801 in words is "fifty-one trillion, three hundred ninety-nine billion, one hundred twelve million, four hundred seventy-eight thousand, eight hundred one".