51335554648 has 64 divisors (see below), whose sum is σ = 111649412160. Its totient is φ = 21672769536.

The previous prime is 51335554597. The next prime is 51335554693. The reversal of 51335554648 is 84645553315.

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, 3496090 + ... + 3510742.

It is an arithmetic number, because the mean of its divisors is an integer number (1744522065).

Almost surely, 2^51335554648 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 51335554648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55824706080).

51335554648 is an abundant number, since it is smaller than the sum of its proper divisors (60313857512).

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

51335554648 is a wasteful number, since it uses less digits than its factorization.

51335554648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15596 (or 15592 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 49.

The spelling of 51335554648 in words is "fifty-one billion, three hundred thirty-five million, five hundred fifty-four thousand, six hundred forty-eight".