51505721050 has 48 divisors (see below), whose sum is σ = 109663784640. Its totient is φ = 17630501760.

The previous prime is 51505721027. The next prime is 51505721077. The reversal of 51505721050 is 5012750515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97782 + ... + 335518.

It is an arithmetic number, because the mean of its divisors is an integer number (2284662180).

Almost surely, 2^51505721050 is an apocalyptic number.

51505721050 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51505721050 is an abundant number, since it is smaller than the sum of its proper divisors (58158063590).

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

51505721050 is a wasteful number, since it uses less digits than its factorization.

51505721050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238375 (or 238370 counting only the distinct ones).

The product of its (nonzero) digits is 8750, while the sum is 31.

The spelling of 51505721050 in words is "fifty-one billion, five hundred five million, seven hundred twenty-one thousand, fifty".