66441911 has 2 divisors, whose sum is σ = 66441912. Its totient is φ = 66441910.

The previous prime is 66441887. The next prime is 66441919. The reversal of 66441911 is 11914466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66441911 - 2¹⁸ = 66179767 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66441919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33220955 + 33220956.

It is an arithmetic number, because the mean of its divisors is an integer number (33220956).

Almost surely, 2^66441911 is an apocalyptic number.

66441911 is a deficient number, since it is larger than the sum of its proper divisors (1).

66441911 is an equidigital number, since it uses as much as digits as its factorization.

66441911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 66441911 is about 8151.1907719057. The cubic root of 66441911 is about 405.0239502170.

The spelling of 66441911 in words is "sixty-six million, four hundred forty-one thousand, nine hundred eleven".