51223044065 has 4 divisors (see below), whose sum is σ = 61467652884. Its totient is φ = 40978435248.

The previous prime is 51223044049. The next prime is 51223044073. The reversal of 51223044065 is 56044032215.

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 38761340641 + 12461703424 = 196879^2 + 111632^2 .

It is a cyclic number.

It is not a de Polignac number, because 51223044065 - 2⁴ = 51223044049 is a prime.

It is a Duffinian number.

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, 5122304402 + ... + 5122304411.

It is an arithmetic number, because the mean of its divisors is an integer number (15366913221).

Almost surely, 2^51223044065 is an apocalyptic number.

It is an amenable number.

51223044065 is a deficient number, since it is larger than the sum of its proper divisors (10244608819).

51223044065 is a wasteful number, since it uses less digits than its factorization.

51223044065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244608818.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 51223044065 in words is "fifty-one billion, two hundred twenty-three million, forty-four thousand, sixty-five".