51807439798 has 4 divisors (see below), whose sum is σ = 77711159700. Its totient is φ = 25903719898.

The previous prime is 51807439793. The next prime is 51807439829. The reversal of 51807439798 is 89793470815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89793470815 = 5 ⋅17958694163.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51807439793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12951859948 + ... + 12951859951.

It is an arithmetic number, because the mean of its divisors is an integer number (19427789925).

Almost surely, 2^51807439798 is an apocalyptic number.

51807439798 is a deficient number, since it is larger than the sum of its proper divisors (25903719902).

51807439798 is a wasteful number, since it uses less digits than its factorization.

51807439798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25903719901.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 51807439798 in words is "fifty-one billion, eight hundred seven million, four hundred thirty-nine thousand, seven hundred ninety-eight".