66361745 has 8 divisors (see below), whose sum is σ = 80725416. Its totient is φ = 52361856.

The previous prime is 66361733. The next prime is 66361753. The reversal of 66361745 is 54716366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9193024 + 57168721 = 3032^2 + 7561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66361745 - 2¹² = 66357649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66361699 and 66361708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90542 + ... + 91271.

It is an arithmetic number, because the mean of its divisors is an integer number (10090677).

Almost surely, 2^66361745 is an apocalyptic number.

It is an amenable number.

66361745 is a deficient number, since it is larger than the sum of its proper divisors (14363671).

66361745 is a wasteful number, since it uses less digits than its factorization.

66361745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181891.

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

The square root of 66361745 is about 8146.2718466793. The cubic root of 66361745 is about 404.8609897357.

The spelling of 66361745 in words is "sixty-six million, three hundred sixty-one thousand, seven hundred forty-five".