51502016721 has 8 divisors (see below), whose sum is σ = 72283532320. Its totient is φ = 32527589472.

The previous prime is 51502016641. The next prime is 51502016723. The reversal of 51502016721 is 12761020515.

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

It is not a de Polignac number, because 51502016721 - 2¹¹ = 51502014673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51502016723) 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, 451772020 + ... + 451772133.

It is an arithmetic number, because the mean of its divisors is an integer number (9035441540).

Almost surely, 2^51502016721 is an apocalyptic number.

It is an amenable number.

51502016721 is a deficient number, since it is larger than the sum of its proper divisors (20781515599).

51502016721 is a wasteful number, since it uses less digits than its factorization.

51502016721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903544175.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 51502016721 in words is "fifty-one billion, five hundred two million, sixteen thousand, seven hundred twenty-one".