51665284836 has 192 divisors, whose sum is σ = 156026787840. Its totient is φ = 14626846080.

The previous prime is 51665284819. The next prime is 51665284843. The reversal of 51665284836 is 63848256615.

51665284836 is a `hidden beast` number, since 51 + 66 + 52 + 8 + 483 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1152946 + ... + 1196918.

It is an arithmetic number, because the mean of its divisors is an integer number (812639520).

Almost surely, 2^51665284836 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 51665284836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78013393920).

51665284836 is an abundant number, since it is smaller than the sum of its proper divisors (104361503004).

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

51665284836 is a wasteful number, since it uses less digits than its factorization.

51665284836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44063 (or 44055 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 51665284836 in words is "fifty-one billion, six hundred sixty-five million, two hundred eighty-four thousand, eight hundred thirty-six".