51721055650 has 96 divisors (see below), whose sum is σ = 113043050496. Its totient is φ = 17409480000.

The previous prime is 51721055593. The next prime is 51721055651. The reversal of 51721055650 is 5655012715.

It is not an unprimeable number, because it can be changed into a prime (51721055651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 326205 + ... + 458095.

It is an arithmetic number, because the mean of its divisors is an integer number (1177531776).

Almost surely, 2^51721055650 is an apocalyptic number.

51721055650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51721055650 is an abundant number, since it is smaller than the sum of its proper divisors (61321994846).

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

51721055650 is a wasteful number, since it uses less digits than its factorization.

51721055650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131968 (or 131963 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 37.

The spelling of 51721055650 in words is "fifty-one billion, seven hundred twenty-one million, fifty-five thousand, six hundred fifty".