51206400200 has 36 divisors (see below), whose sum is σ = 119062321395. Its totient is φ = 20481280000.

The previous prime is 51206400187. The next prime is 51206400211. The reversal of 51206400200 is 200460215.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 37680244996 + 13526155204 = 194114^2 + 116302^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=160010.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3192200 + ... + 3208200.

Almost surely, 2^51206400200 is an apocalyptic number.

51206400200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51206400200 is an abundant number, since it is smaller than the sum of its proper divisors (67855921195).

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

51206400200 is an frugal number, since it uses more digits than its factorization.

51206400200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32018 (or 16008 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 51206400200 its reverse (200460215), we get a palindrome (51406860415).

The spelling of 51206400200 in words is "fifty-one billion, two hundred six million, four hundred thousand, two hundred".