51550104400 has 30 divisors (see below), whose sum is σ = 123849126782. Its totient is φ = 20620041600.

The previous prime is 51550104341. The next prime is 51550104407. The reversal of 51550104400 is 440105515.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4212529216 + 47337575184 = 64904^2 + 217572^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550104407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64437231 + ... + 64438030.

Almost surely, 2^51550104400 is an apocalyptic number.

51550104400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51550104400 is an abundant number, since it is smaller than the sum of its proper divisors (72299022382).

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

51550104400 is a wasteful number, since it uses less digits than its factorization.

51550104400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128875279 (or 128875268 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 51550104400 its reverse (440105515), we get a palindrome (51990209915).

The spelling of 51550104400 in words is "fifty-one billion, five hundred fifty million, one hundred four thousand, four hundred".