51420245200 has 30 divisors (see below), whose sum is σ = 123537140054. Its totient is φ = 20568097920.

The previous prime is 51420245171. The next prime is 51420245269. The reversal of 51420245200 is 254202415.

It can be written as a sum of positive squares in 3 ways, for example, as 14683622976 + 36736622224 = 121176^2 + 191668^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

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 5 ways as a sum of consecutive naturals, for example, 64274907 + ... + 64275706.

Almost surely, 2^51420245200 is an apocalyptic number.

51420245200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51420245200 is an abundant number, since it is smaller than the sum of its proper divisors (72116894854).

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

51420245200 is a wasteful number, since it uses less digits than its factorization.

51420245200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128550631 (or 128550620 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 51420245200 its reverse (254202415), we get a palindrome (51674447615).

The spelling of 51420245200 in words is "fifty-one billion, four hundred twenty million, two hundred forty-five thousand, two hundred".