51721833837 has 8 divisors (see below), whose sum is σ = 70826295136. Its totient is φ = 33549297552.

The previous prime is 51721833817. The next prime is 51721833841. The reversal of 51721833837 is 73833812715.

51721833837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51721833837 - 2¹⁴ = 51721817453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51721833817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232981123 + ... + 232981344.

It is an arithmetic number, because the mean of its divisors is an integer number (8853286892).

Almost surely, 2^51721833837 is an apocalyptic number.

It is an amenable number.

51721833837 is a deficient number, since it is larger than the sum of its proper divisors (19104461299).

51721833837 is a wasteful number, since it uses less digits than its factorization.

51721833837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465962507.

The product of its digits is 846720, while the sum is 48.

The spelling of 51721833837 in words is "fifty-one billion, seven hundred twenty-one million, eight hundred thirty-three thousand, eight hundred thirty-seven".