51551470400 has 42 divisors (see below), whose sum is σ = 126848840790. Its totient is φ = 20620587520.

The previous prime is 51551470391. The next prime is 51551470423. The reversal of 51551470400 is 407415515.

It can be written as a sum of positive squares in 3 ways, for example, as 1386221824 + 50165248576 = 37232^2 + 223976^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16108235 + ... + 16111434.

It is an arithmetic number, because the mean of its divisors is an integer number (3020210495).

Almost surely, 2^51551470400 is an apocalyptic number.

51551470400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51551470400 is an abundant number, since it is smaller than the sum of its proper divisors (75297370390).

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

51551470400 is a wasteful number, since it uses less digits than its factorization.

51551470400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32219691 (or 32219676 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

Adding to 51551470400 its reverse (407415515), we get a palindrome (51958885915).

The spelling of 51551470400 in words is "fifty-one billion, five hundred fifty-one million, four hundred seventy thousand, four hundred".