51530780317 has 4 divisors (see below), whose sum is σ = 51532324416. Its totient is φ = 51529236220.

The previous prime is 51530780303. The next prime is 51530780381. The reversal of 51530780317 is 71308703515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51530780317 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 51530780317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530780387) 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, 720859 + ... + 789112.

It is an arithmetic number, because the mean of its divisors is an integer number (12883081104).

Almost surely, 2^51530780317 is an apocalyptic number.

It is an amenable number.

51530780317 is a deficient number, since it is larger than the sum of its proper divisors (1544099).

51530780317 is a wasteful number, since it uses less digits than its factorization.

51530780317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544098.

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 51530780317 in words is "fifty-one billion, five hundred thirty million, seven hundred eighty thousand, three hundred seventeen".