66466643 has 2 divisors, whose sum is σ = 66466644. Its totient is φ = 66466642.

The previous prime is 66466607. The next prime is 66466661. The reversal of 66466643 is 34666466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66466643 - 2¹² = 66462547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66466643.

It is not a weakly prime, because it can be changed into another prime (66460643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33233321 + 33233322.

It is an arithmetic number, because the mean of its divisors is an integer number (33233322).

Almost surely, 2^66466643 is an apocalyptic number.

66466643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66466643 is an equidigital number, since it uses as much as digits as its factorization.

66466643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 41.

The square root of 66466643 is about 8152.7077097122. The cubic root of 66466643 is about 405.0741986699.

The spelling of 66466643 in words is "sixty-six million, four hundred sixty-six thousand, six hundred forty-three".