51213718329 has 8 divisors (see below), whose sum is σ = 68293098432. Its totient is φ = 34138408560.

The previous prime is 51213718301. The next prime is 51213718337. The reversal of 51213718329 is 92381731215.

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

It is not a de Polignac number, because 51213718329 - 2¹⁵ = 51213685561 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51213718349) 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, 988102 + ... + 1038639.

It is an arithmetic number, because the mean of its divisors is an integer number (8536637304).

Almost surely, 2^51213718329 is an apocalyptic number.

It is an amenable number.

51213718329 is a deficient number, since it is larger than the sum of its proper divisors (17079380103).

51213718329 is a wasteful number, since it uses less digits than its factorization.

51213718329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035167.

The product of its digits is 90720, while the sum is 42.

The spelling of 51213718329 in words is "fifty-one billion, two hundred thirteen million, seven hundred eighteen thousand, three hundred twenty-nine".