51658358721 has 16 divisors (see below), whose sum is σ = 69502717440. Its totient is φ = 34126588160.

The previous prime is 51658358683. The next prime is 51658358743. The reversal of 51658358721 is 12785385615.

It is a cyclic number.

It is not a de Polignac number, because 51658358721 - 2¹⁰ = 51658357697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51658358771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1810000 + ... + 1838318.

It is an arithmetic number, because the mean of its divisors is an integer number (4343919840).

Almost surely, 2^51658358721 is an apocalyptic number.

It is an amenable number.

51658358721 is a deficient number, since it is larger than the sum of its proper divisors (17844358719).

51658358721 is a wasteful number, since it uses less digits than its factorization.

51658358721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33816.

The product of its digits is 2016000, while the sum is 51.

The spelling of 51658358721 in words is "fifty-one billion, six hundred fifty-eight million, three hundred fifty-eight thousand, seven hundred twenty-one".