66441519 has 8 divisors (see below), whose sum is σ = 98431920. Its totient is φ = 44294328.

The previous prime is 66441517. The next prime is 66441521. The reversal of 66441519 is 91514466.

66441519 is a `hidden beast` number, since 6 + 644 + 1 + 5 + 1 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (66441517) and next prime (66441521).

It is not a de Polignac number, because 66441519 - 2¹ = 66441517 is a prime.

It is a super-2 number, since 2×66441519² = 8828950894054722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66441511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230372 + ... + 1230425.

It is an arithmetic number, because the mean of its divisors is an integer number (12303990).

Almost surely, 2^66441519 is an apocalyptic number.

66441519 is a deficient number, since it is larger than the sum of its proper divisors (31990401).

66441519 is a wasteful number, since it uses less digits than its factorization.

66441519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460806 (or 2460800 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 66441519 is about 8151.1667263037. The cubic root of 66441519 is about 405.0231536831.

The spelling of 66441519 in words is "sixty-six million, four hundred forty-one thousand, five hundred nineteen".