51305504521 has 16 divisors (see below), whose sum is σ = 51983769600. Its totient is φ = 50632815168.

The previous prime is 51305504443. The next prime is 51305504531. The reversal of 51305504521 is 12540550315.

It is a cyclic number.

It is not a de Polignac number, because 51305504521 - 2¹¹ = 51305502473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51305504531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17819160 + ... + 17822038.

It is an arithmetic number, because the mean of its divisors is an integer number (3248985600).

Almost surely, 2^51305504521 is an apocalyptic number.

It is an amenable number.

51305504521 is a deficient number, since it is larger than the sum of its proper divisors (678265079).

51305504521 is a wasteful number, since it uses less digits than its factorization.

51305504521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3768.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 51305504521 in words is "fifty-one billion, three hundred five million, five hundred four thousand, five hundred twenty-one".