51648722544 has 80 divisors (see below), whose sum is σ = 138266864640. Its totient is φ = 16595927040.

The previous prime is 51648722539. The next prime is 51648722597. The reversal of 51648722544 is 44522784615.

It is a super-3 number, since 3×51648722544³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 51648722493 and 51648722502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314887 + ... + 449945.

It is an arithmetic number, because the mean of its divisors is an integer number (1728335808).

Almost surely, 2^51648722544 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 51648722544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69133432320).

51648722544 is an abundant number, since it is smaller than the sum of its proper divisors (86618142096).

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

51648722544 is a wasteful number, since it uses less digits than its factorization.

51648722544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135358 (or 135352 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 48.

The spelling of 51648722544 in words is "fifty-one billion, six hundred forty-eight million, seven hundred twenty-two thousand, five hundred forty-four".