51916741640 has 16 divisors (see below), whose sum is σ = 116812668780. Its totient is φ = 20766696640.

The previous prime is 51916741637. The next prime is 51916741661. The reversal of 51916741640 is 4614761915.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41688655684 + 10228085956 = 204178^2 + 101134^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51916741591 and 51916741600.

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, 648959231 + ... + 648959310.

Almost surely, 2^51916741640 is an apocalyptic number.

It is an amenable number.

51916741640 is an abundant number, since it is smaller than the sum of its proper divisors (64895927140).

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

51916741640 is a wasteful number, since it uses less digits than its factorization.

51916741640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297918552 (or 1297918548 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 51916741640 in words is "fifty-one billion, nine hundred sixteen million, seven hundred forty-one thousand, six hundred forty".