51399208799 has 4 divisors (see below), whose sum is σ = 52652848080. Its totient is φ = 50145569520.

The previous prime is 51399208793. The next prime is 51399208801. The reversal of 51399208799 is 99780299315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99780299315 = 5 ⋅19956059863.

It is a cyclic number.

It is not a de Polignac number, because 51399208799 - 2⁸ = 51399208543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51399208793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626819579 + ... + 626819660.

It is an arithmetic number, because the mean of its divisors is an integer number (13163212020).

Almost surely, 2^51399208799 is an apocalyptic number.

51399208799 is a deficient number, since it is larger than the sum of its proper divisors (1253639281).

51399208799 is a wasteful number, since it uses less digits than its factorization.

51399208799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253639280.

The product of its (nonzero) digits is 11022480, while the sum is 62.

The spelling of 51399208799 in words is "fifty-one billion, three hundred ninety-nine million, two hundred eight thousand, seven hundred ninety-nine".