51263444669 has 2 divisors, whose sum is σ = 51263444670. Its totient is φ = 51263444668.

The previous prime is 51263444653. The next prime is 51263444693. The reversal of 51263444669 is 96644436215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37700047225 + 13563397444 = 194165^2 + 116462^2 .

It is a cyclic number.

It is not a de Polignac number, because 51263444669 - 2⁴ = 51263444653 is a prime.

It is a super-2 number, since 2×51263444669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51263446669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25631722334 + 25631722335.

It is an arithmetic number, because the mean of its divisors is an integer number (25631722335).

Almost surely, 2^51263444669 is an apocalyptic number.

It is an amenable number.

51263444669 is a deficient number, since it is larger than the sum of its proper divisors (1).

51263444669 is an equidigital number, since it uses as much as digits as its factorization.

51263444669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 50.

The spelling of 51263444669 in words is "fifty-one billion, two hundred sixty-three million, four hundred forty-four thousand, six hundred sixty-nine".