51455320000 has 280 divisors, whose sum is σ = 147069722624. Its totient is φ = 17490816000.

The previous prime is 51455319997. The next prime is 51455320031. The reversal of 51455320000 is 2355415.

It is a tau number, because it is divible by the number of its divisors (280).

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 polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35559277 + ... + 35560723.

Almost surely, 2^51455320000 is an apocalyptic number.

51455320000 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 51455320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73534861312).

51455320000 is an abundant number, since it is smaller than the sum of its proper divisors (95614402624).

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

51455320000 is a wasteful number, since it uses less digits than its factorization.

51455320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 51455320000 its reverse (2355415), we get a palindrome (51457675415).

The spelling of 51455320000 in words is "fifty-one billion, four hundred fifty-five million, three hundred twenty thousand".