51518010613 has 8 divisors (see below), whose sum is σ = 52039289016. Its totient is φ = 50996952000.

The previous prime is 51518010589. The next prime is 51518010619. The reversal of 51518010613 is 31601081515.

It can be written as a sum of positive squares in 4 ways, for example, as 32825105329 + 18692905284 = 181177^2 + 136722^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51518010613 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 (51518010619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438495 + ... + 543427.

It is an arithmetic number, because the mean of its divisors is an integer number (6504911127).

Almost surely, 2^51518010613 is an apocalyptic number.

It is an amenable number.

51518010613 is a deficient number, since it is larger than the sum of its proper divisors (521278403).

51518010613 is a wasteful number, since it uses less digits than its factorization.

51518010613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109895.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 51518010613 in words is "fifty-one billion, five hundred eighteen million, ten thousand, six hundred thirteen".