51510510656 has 112 divisors (see below), whose sum is σ = 116250232320. Its totient is φ = 22433280000.

The previous prime is 51510510641. The next prime is 51510510743. The reversal of 51510510656 is 65601501515.

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, 2192540 + ... + 2215908.

Almost surely, 2^51510510656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51510510656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58125116160).

51510510656 is an abundant number, since it is smaller than the sum of its proper divisors (64739721664).

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

51510510656 is a wasteful number, since it uses less digits than its factorization.

51510510656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23524 (or 23514 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 51510510656 in words is "fifty-one billion, five hundred ten million, five hundred ten thousand, six hundred fifty-six".