66516041 has 4 divisors (see below), whose sum is σ = 66580500. Its totient is φ = 66451584.

The previous prime is 66516031. The next prime is 66516071. The reversal of 66516041 is 14061566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14061566 = 2 ⋅7030783.

It can be written as a sum of positive squares in 2 ways, for example, as 31753225 + 34762816 = 5635^2 + 5896^2 .

It is a cyclic number.

It is not a de Polignac number, because 66516041 - 2¹⁸ = 66253897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66515995 and 66516013.

It is not an unprimeable number, because it can be changed into a prime (66516031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30656 + ... + 32753.

It is an arithmetic number, because the mean of its divisors is an integer number (16645125).

Almost surely, 2^66516041 is an apocalyptic number.

It is an amenable number.

66516041 is a deficient number, since it is larger than the sum of its proper divisors (64459).

66516041 is a wasteful number, since it uses less digits than its factorization.

66516041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64458.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66516041 is about 8155.7366926600. The cubic root of 66516041 is about 405.1745241831.

The spelling of 66516041 in words is "sixty-six million, five hundred sixteen thousand, forty-one".