51745663 has 2 divisors, whose sum is σ = 51745664. Its totient is φ = 51745662.

The previous prime is 51745643. The next prime is 51745691. The reversal of 51745663 is 36654715.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51745663 is a prime.

It is a super-2 number, since 2×51745663² = 5355227278619138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51745643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25872831 + 25872832.

It is an arithmetic number, because the mean of its divisors is an integer number (25872832).

Almost surely, 2^51745663 is an apocalyptic number.

51745663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51745663 is an equidigital number, since it uses as much as digits as its factorization.

51745663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 37.

The square root of 51745663 is about 7193.4458363152. The cubic root of 51745663 is about 372.6415851427.

The spelling of 51745663 in words is "fifty-one million, seven hundred forty-five thousand, six hundred sixty-three".