51312123404340 has 96 divisors (see below), whose sum is σ = 146586135870720. Its totient is φ = 13406591717376.

The previous prime is 51312123404317. The next prime is 51312123404341. The reversal of 51312123404340 is 4340432121315.

It is a super-2 number, since 2×51312123404340² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312123404341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8785725 + ... + 13409444.

It is an arithmetic number, because the mean of its divisors is an integer number (1526938915320).

Almost surely, 2^{51312123404340} is an apocalyptic number.

It is an amenable number.

51312123404340 is an abundant number, since it is smaller than the sum of its proper divisors (95274012466380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51312123404340 is a wasteful number, since it uses less digits than its factorization.

51312123404340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22195961 (or 22195959 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 51312123404340 its reverse (4340432121315), we get a palindrome (55652555525655).

The spelling of 51312123404340 in words is "fifty-one trillion, three hundred twelve billion, one hundred twenty-three million, four hundred four thousand, three hundred forty".