66413619 has 6 divisors (see below), whose sum is σ = 95930796. Its totient is φ = 44275740.

The previous prime is 66413597. The next prime is 66413639. The reversal of 66413619 is 91631466.

66413619 is a `hidden beast` number, since 6 + 641 + 3 + 6 + 1 + 9 = 666.

It is not a de Polignac number, because 66413619 - 2²¹ = 64316467 is a prime.

It is a super-2 number, since 2×66413619² = 8821537577354322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66413639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3689637 + ... + 3689654.

It is an arithmetic number, because the mean of its divisors is an integer number (15988466).

Almost surely, 2^66413619 is an apocalyptic number.

66413619 is a deficient number, since it is larger than the sum of its proper divisors (29517177).

66413619 is a wasteful number, since it uses less digits than its factorization.

66413619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7379297 (or 7379294 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 66413619 is about 8149.4551351609. The cubic root of 66413619 is about 404.9664535543.

The spelling of 66413619 in words is "sixty-six million, four hundred thirteen thousand, six hundred nineteen".