51551482323420 has 144 divisors (see below), whose sum is σ = 160059346967520. Its totient is φ = 13423172087808.

The previous prime is 51551482323409. The next prime is 51551482323457. The reversal of 51551482323420 is 2432328415515.

It is a happy number.

51551482323420 is a `hidden beast` number, since 5 + 1 + 5 + 514 + 82 + 3 + 2 + 34 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23799892 + ... + 25875428.

It is an arithmetic number, because the mean of its divisors is an integer number (1111523242830).

Almost surely, 2^{51551482323420} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51551482323420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80029673483760).

51551482323420 is an abundant number, since it is smaller than the sum of its proper divisors (108507864644100).

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

51551482323420 is a wasteful number, since it uses less digits than its factorization.

51551482323420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078804 (or 2078799 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 51551482323420 in words is "fifty-one trillion, five hundred fifty-one billion, four hundred eighty-two million, three hundred twenty-three thousand, four hundred twenty".