51665102200 has 96 divisors (see below), whose sum is σ = 124541136000. Its totient is φ = 19911513600.

The previous prime is 51665102191. The next prime is 51665102227. The reversal of 51665102200 is 220156615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1401606 + ... + 1437994.

It is an arithmetic number, because the mean of its divisors is an integer number (1297303500).

Almost surely, 2^51665102200 is an apocalyptic number.

51665102200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51665102200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62270568000).

51665102200 is an abundant number, since it is smaller than the sum of its proper divisors (72876033800).

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

51665102200 is a wasteful number, since it uses less digits than its factorization.

51665102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36665 (or 36656 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 51665102200 its reverse (220156615), we get a palindrome (51885258815).

The spelling of 51665102200 in words is "fifty-one billion, six hundred sixty-five million, one hundred two thousand, two hundred".