51643515305 has 16 divisors (see below), whose sum is σ = 63875340288. Its totient is φ = 40065144000.

The previous prime is 51643515281. The next prime is 51643515311. The reversal of 51643515305 is 50351534615.

It is not a de Polignac number, because 51643515305 - 2¹² = 51643511209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170761 + ... + 1214070.

It is an arithmetic number, because the mean of its divisors is an integer number (3992208768).

Almost surely, 2^51643515305 is an apocalyptic number.

It is an amenable number.

51643515305 is a deficient number, since it is larger than the sum of its proper divisors (12231824983).

51643515305 is a wasteful number, since it uses less digits than its factorization.

51643515305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384968.

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 51643515305 in words is "fifty-one billion, six hundred forty-three million, five hundred fifteen thousand, three hundred five".