51297218013 has 4 divisors (see below), whose sum is σ = 68396290688. Its totient is φ = 34198145340.

The previous prime is 51297217999. The next prime is 51297218099. The reversal of 51297218013 is 31081279215.

It is a happy number.

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 not a de Polignac number, because 51297218013 - 2⁵ = 51297217981 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 (51297218513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8549536333 + ... + 8549536338.

It is an arithmetic number, because the mean of its divisors is an integer number (17099072672).

Almost surely, 2^51297218013 is an apocalyptic number.

It is an amenable number.

51297218013 is a deficient number, since it is larger than the sum of its proper divisors (17099072675).

51297218013 is a wasteful number, since it uses less digits than its factorization.

51297218013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17099072674.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 51297218013 in words is "fifty-one billion, two hundred ninety-seven million, two hundred eighteen thousand, thirteen".