51563366400 has 1728 divisors, whose sum is σ = 233400061440. Its totient is φ = 9909043200.

The previous prime is 51563366399. The next prime is 51563366443. The reversal of 51563366400 is 466336515.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1663334385 + ... + 1663334415.

It is an arithmetic number, because the mean of its divisors is an integer number (135069480).

Almost surely, 2^51563366400 is an apocalyptic number.

51563366400 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 51563366400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116700030720).

51563366400 is an abundant number, since it is smaller than the sum of its proper divisors (181836695040).

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

51563366400 is a wasteful number, since it uses less digits than its factorization.

51563366400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 51563366400 in words is "fifty-one billion, five hundred sixty-three million, three hundred sixty-six thousand, four hundred".