51613635656 has 64 divisors (see below), whose sum is σ = 108657158400. Its totient is φ = 22785044800.

The previous prime is 51613635649. The next prime is 51613635673. The reversal of 51613635656 is 65653631615.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51613635656.

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, 371051 + ... + 490821.

It is an arithmetic number, because the mean of its divisors is an integer number (1697768100).

Almost surely, 2^51613635656 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 51613635656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54328579200).

51613635656 is an abundant number, since it is smaller than the sum of its proper divisors (57043522744).

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

51613635656 is a wasteful number, since it uses less digits than its factorization.

51613635656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119930 (or 119926 counting only the distinct ones).

The product of its digits is 1458000, while the sum is 47.

The spelling of 51613635656 in words is "fifty-one billion, six hundred thirteen million, six hundred thirty-five thousand, six hundred fifty-six".