51721754550 has 96 divisors (see below), whose sum is σ = 136566821664. Its totient is φ = 12909312000.

The previous prime is 51721754549. The next prime is 51721754563. The reversal of 51721754550 is 5545712715.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 405520 + ... + 517580.

It is an arithmetic number, because the mean of its divisors is an integer number (1422571059).

Almost surely, 2^51721754550 is an apocalyptic number.

51721754550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51721754550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68283410832).

51721754550 is an abundant number, since it is smaller than the sum of its proper divisors (84845067114).

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

51721754550 is a wasteful number, since it uses less digits than its factorization.

51721754550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112274 (or 112269 counting only the distinct ones).

The product of its (nonzero) digits is 245000, while the sum is 42.

The spelling of 51721754550 in words is "fifty-one billion, seven hundred twenty-one million, seven hundred fifty-four thousand, five hundred fifty".