51517319803 has 4 divisors (see below), whose sum is σ = 51517773880. Its totient is φ = 51516865728.

The previous prime is 51517319797. The next prime is 51517319813. The reversal of 51517319803 is 30891371515.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51517319803 - 2⁵ = 51517319771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51517319803.

It is not an unprimeable number, because it can be changed into a prime (51517319813) 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, 105451 + ... + 337867.

It is an arithmetic number, because the mean of its divisors is an integer number (12879443470).

Almost surely, 2^51517319803 is an apocalyptic number.

51517319803 is a deficient number, since it is larger than the sum of its proper divisors (454077).

51517319803 is a wasteful number, since it uses less digits than its factorization.

51517319803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454076.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 51517319803 in words is "fifty-one billion, five hundred seventeen million, three hundred nineteen thousand, eight hundred three".