51020005604 has 12 divisors (see below), whose sum is σ = 89778298428. Its totient is φ = 25369063200.

The previous prime is 51020005579. The next prime is 51020005613. The reversal of 51020005604 is 40650002015.

It can be written as a sum of positive squares in 2 ways, for example, as 15068053504 + 35951952100 = 122752^2 + 189610^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51020005604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35234087 + ... + 35235534.

It is an arithmetic number, because the mean of its divisors is an integer number (7481524869).

Almost surely, 2^51020005604 is an apocalyptic number.

It is an amenable number.

51020005604 is a deficient number, since it is larger than the sum of its proper divisors (38758292824).

51020005604 is a wasteful number, since it uses less digits than its factorization.

51020005604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70469806 (or 70469804 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 51020005604 its reverse (40650002015), we get a palindrome (91670007619).

The spelling of 51020005604 in words is "fifty-one billion, twenty million, five thousand, six hundred four".