51210630064640 has 40 divisors (see below), whose sum is σ = 122785487247060. Its totient is φ = 20484252024832.

The previous prime is 51210630064609. The next prime is 51210630064687. The reversal of 51210630064640 is 4646003601215.

It can be written as a sum of positive squares in 2 ways, for example, as 49120361822464 + 2090268242176 = 7008592^2 + 1445776^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 51210630064594 and 51210630064603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10002073625 + ... + 10002078744.

Almost surely, 2^{51210630064640} is an apocalyptic number.

It is an amenable number.

51210630064640 is an abundant number, since it is smaller than the sum of its proper divisors (71574857182420).

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

51210630064640 is an equidigital number, since it uses as much as digits as its factorization.

51210630064640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20004152392 (or 20004152376 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 51210630064640 its reverse (4646003601215), we get a palindrome (55856633665855).

The spelling of 51210630064640 in words is "fifty-one trillion, two hundred ten billion, six hundred thirty million, sixty-four thousand, six hundred forty".