51620641848 has 128 divisors (see below), whose sum is σ = 152068492800. Its totient is φ = 16168785408.

The previous prime is 51620641823. The next prime is 51620641909. The reversal of 51620641848 is 84814602615.

It is a happy number.

51620641848 is a `hidden beast` number, since 5 + 1 + 620 + 6 + 4 + 18 + 4 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2350165 + ... + 2372027.

It is an arithmetic number, because the mean of its divisors is an integer number (1188035100).

Almost surely, 2^51620641848 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 51620641848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76034246400).

51620641848 is an abundant number, since it is smaller than the sum of its proper divisors (100447850952).

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

51620641848 is a wasteful number, since it uses less digits than its factorization.

51620641848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22538 (or 22528 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 51620641848 in words is "fifty-one billion, six hundred twenty million, six hundred forty-one thousand, eight hundred forty-eight".