61665743 has 2 divisors, whose sum is σ = 61665744. Its totient is φ = 61665742.

The previous prime is 61665733. The next prime is 61665757. The reversal of 61665743 is 34756616.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61665743 - 2¹⁰ = 61664719 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 61665697 and 61665706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61665733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30832871 + 30832872.

It is an arithmetic number, because the mean of its divisors is an integer number (30832872).

Almost surely, 2^61665743 is an apocalyptic number.

61665743 is a deficient number, since it is larger than the sum of its proper divisors (1).

61665743 is an equidigital number, since it uses as much as digits as its factorization.

61665743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 38.

The square root of 61665743 is about 7852.7538481733. The cubic root of 61665743 is about 395.0766138845.

The spelling of 61665743 in words is "sixty-one million, six hundred sixty-five thousand, seven hundred forty-three".