51203544545 has 4 divisors (see below), whose sum is σ = 61444253460. Its totient is φ = 40962835632.

The previous prime is 51203544527. The next prime is 51203544577. The reversal of 51203544545 is 54544530215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28619165584 + 22584378961 = 169172^2 + 150281^2 .

It is a cyclic number.

It is not a de Polignac number, because 51203544545 - 2⁸ = 51203544289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51203544499 and 51203544508.

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, 5120354450 + ... + 5120354459.

It is an arithmetic number, because the mean of its divisors is an integer number (15361063365).

Almost surely, 2^51203544545 is an apocalyptic number.

It is an amenable number.

51203544545 is a deficient number, since it is larger than the sum of its proper divisors (10240708915).

51203544545 is a wasteful number, since it uses less digits than its factorization.

51203544545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10240708914.

The product of its (nonzero) digits is 240000, while the sum is 38.

The spelling of 51203544545 in words is "fifty-one billion, two hundred three million, five hundred forty-four thousand, five hundred forty-five".