51399634546 has 16 divisors (see below), whose sum is σ = 83353264344. Its totient is φ = 23630598144.

The previous prime is 51399634541. The next prime is 51399634549. The reversal of 51399634546 is 64543699315.

It can be written as a sum of positive squares in 4 ways, for example, as 51365236321 + 34398225 = 226639^2 + 5865^2 .

It is a super-2 number, since 2×51399634546² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51399634541) 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, 3839445 + ... + 3852808.

Almost surely, 2^51399634546 is an apocalyptic number.

51399634546 is a deficient number, since it is larger than the sum of its proper divisors (31953629798).

51399634546 is a wasteful number, since it uses less digits than its factorization.

51399634546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692525.

The product of its digits is 10497600, while the sum is 55.

The spelling of 51399634546 in words is "fifty-one billion, three hundred ninety-nine million, six hundred thirty-four thousand, five hundred forty-six".