66623441 has 2 divisors, whose sum is σ = 66623442. Its totient is φ = 66623440.

The previous prime is 66623429. The next prime is 66623467. The reversal of 66623441 is 14432666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54169600 + 12453841 = 7360^2 + 3529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66623441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66623398 and 66623407.

It is not a weakly prime, because it can be changed into another prime (66623471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33311720 + 33311721.

It is an arithmetic number, because the mean of its divisors is an integer number (33311721).

Almost surely, 2^66623441 is an apocalyptic number.

It is an amenable number.

66623441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66623441 is an equidigital number, since it uses as much as digits as its factorization.

66623441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 66623441 is about 8162.3183593879. The cubic root of 66623441 is about 405.3924783455.

The spelling of 66623441 in words is "sixty-six million, six hundred twenty-three thousand, four hundred forty-one".