51605303450 has 24 divisors (see below), whose sum is σ = 95993595228. Its totient is φ = 20640458880.

The previous prime is 51605303443. The next prime is 51605303483. The reversal of 51605303450 is 5430350615.

It can be written as a sum of positive squares in 6 ways, for example, as 45561329401 + 6043974049 = 213451^2 + 77743^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725684 + ... + 793616.

Almost surely, 2^51605303450 is an apocalyptic number.

51605303450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51605303450 is a deficient number, since it is larger than the sum of its proper divisors (44388291778).

51605303450 is a wasteful number, since it uses less digits than its factorization.

51605303450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83138 (or 83133 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The spelling of 51605303450 in words is "fifty-one billion, six hundred five million, three hundred three thousand, four hundred fifty".