51263444653 has 2 divisors, whose sum is σ = 51263444654. Its totient is φ = 51263444652.

The previous prime is 51263444647. The next prime is 51263444669. The reversal of 51263444653 is 35644436215.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47246673769 + 4016770884 = 217363^2 + 63378^2 .

It is a cyclic number.

It is not a de Polignac number, because 51263444653 - 2²⁵ = 51229890221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51263444693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25631722326 + 25631722327.

It is an arithmetic number, because the mean of its divisors is an integer number (25631722327).

Almost surely, 2^51263444653 is an apocalyptic number.

It is an amenable number.

51263444653 is a deficient number, since it is larger than the sum of its proper divisors (1).

51263444653 is an equidigital number, since it uses as much as digits as its factorization.

51263444653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 43.

The spelling of 51263444653 in words is "fifty-one billion, two hundred sixty-three million, four hundred forty-four thousand, six hundred fifty-three".