51315245342 has 4 divisors (see below), whose sum is σ = 76972868016. Its totient is φ = 25657622670.

The previous prime is 51315245341. The next prime is 51315245417. The reversal of 51315245342 is 24354251315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24354251315 = 5 ⋅4870850263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315245341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828811334 + ... + 12828811337.

It is an arithmetic number, because the mean of its divisors is an integer number (19243217004).

Almost surely, 2^51315245342 is an apocalyptic number.

51315245342 is a deficient number, since it is larger than the sum of its proper divisors (25657622674).

51315245342 is a wasteful number, since it uses less digits than its factorization.

51315245342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25657622673.

The product of its digits is 72000, while the sum is 35.

Adding to 51315245342 its reverse (24354251315), we get a palindrome (75669496657).

The spelling of 51315245342 in words is "fifty-one billion, three hundred fifteen million, two hundred forty-five thousand, three hundred forty-two".