51651617244 has 48 divisors (see below), whose sum is σ = 120774393600. Its totient is φ = 17180971776.

The previous prime is 51651617209. The next prime is 51651617261. The reversal of 51651617244 is 44271615615.

It is a junction number, because it is equal to n+sod(n) for n = 51651617196 and 51651617205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15847287 + ... + 15850545.

It is an arithmetic number, because the mean of its divisors is an integer number (2516133200).

Almost surely, 2^51651617244 is an apocalyptic number.

It is an amenable number.

51651617244 is an abundant number, since it is smaller than the sum of its proper divisors (69122776356).

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

51651617244 is a wasteful number, since it uses less digits than its factorization.

51651617244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642 (or 5640 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The spelling of 51651617244 in words is "fifty-one billion, six hundred fifty-one million, six hundred seventeen thousand, two hundred forty-four".