66550441 has 2 divisors, whose sum is σ = 66550442. Its totient is φ = 66550440.

The previous prime is 66550409. The next prime is 66550481. The reversal of 66550441 is 14405566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61168041 + 5382400 = 7821^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 66550441 - 2⁵ = 66550409 is a prime.

It is a super-2 number, since 2×66550441² = 8857922394588962, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3926812 and since 66550441 and 3926812 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66550481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275220 + 33275221.

It is an arithmetic number, because the mean of its divisors is an integer number (33275221).

Almost surely, 2^66550441 is an apocalyptic number.

It is an amenable number.

66550441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66550441 is an equidigital number, since it uses as much as digits as its factorization.

66550441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 66550441 is about 8157.8453650458. The cubic root of 66550441 is about 405.2443599768.

The spelling of 66550441 in words is "sixty-six million, five hundred fifty thousand, four hundred forty-one".