51681343514 has 8 divisors (see below), whose sum is σ = 77523633300. Its totient is φ = 25840132416.

The previous prime is 51681343513. The next prime is 51681343531. The reversal of 51681343514 is 41534318615.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51680292889 + 1050625 = 227333^2 + 1025^2 .

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

It is a super-2 number, since 2×51681343514² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51681343513) 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, 136799 + ... + 349394.

Almost surely, 2^51681343514 is an apocalyptic number.

51681343514 is a deficient number, since it is larger than the sum of its proper divisors (25842289786).

51681343514 is a wasteful number, since it uses less digits than its factorization.

51681343514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539344.

The product of its digits is 172800, while the sum is 41.

The spelling of 51681343514 in words is "fifty-one billion, six hundred eighty-one million, three hundred forty-three thousand, five hundred fourteen".