51225722665 has 12 divisors (see below), whose sum is σ = 66563129484. Its totient is φ = 37828225344.

The previous prime is 51225722591. The next prime is 51225722683. The reversal of 51225722665 is 56622752215.

It can be written as a sum of positive squares in 6 ways, for example, as 259951129 + 50965771536 = 16123^2 + 225756^2 .

It is not a de Polignac number, because 51225722665 - 2¹¹ = 51225720617 is a prime.

It is a Duffinian 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, 30310234 + ... + 30311923.

It is an arithmetic number, because the mean of its divisors is an integer number (5546927457).

Almost surely, 2^51225722665 is an apocalyptic number.

It is an amenable number.

51225722665 is a deficient number, since it is larger than the sum of its proper divisors (15337406819).

51225722665 is a wasteful number, since it uses less digits than its factorization.

51225722665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60622188 (or 60622175 counting only the distinct ones).

The product of its digits is 504000, while the sum is 43.

The spelling of 51225722665 in words is "fifty-one billion, two hundred twenty-five million, seven hundred twenty-two thousand, six hundred sixty-five".