66017531 has 2 divisors, whose sum is σ = 66017532. Its totient is φ = 66017530.

The previous prime is 66017417. The next prime is 66017551. The reversal of 66017531 is 13571066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66017531 - 2¹⁸ = 65755387 is a prime.

It is a super-2 number, since 2×66017531² = 8716628798671922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66017494 and 66017503.

It is not a weakly prime, because it can be changed into another prime (66017551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33008765 + 33008766.

It is an arithmetic number, because the mean of its divisors is an integer number (33008766).

Almost surely, 2^66017531 is an apocalyptic number.

66017531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66017531 is an equidigital number, since it uses as much as digits as its factorization.

66017531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 66017531 is about 8125.1172914611. The cubic root of 66017531 is about 404.1597801970.

Adding to 66017531 its reverse (13571066), we get a palindrome (79588597).

The spelling of 66017531 in words is "sixty-six million, seventeen thousand, five hundred thirty-one".