66440414 has 8 divisors (see below), whose sum is σ = 99905520. Its totient is φ = 33138576.

The previous prime is 66440401. The next prime is 66440447. The reversal of 66440414 is 41404466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66440414² = 8828657224982792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39794 + ... + 41429.

It is an arithmetic number, because the mean of its divisors is an integer number (12488190).

Almost surely, 2^66440414 is an apocalyptic number.

66440414 is a deficient number, since it is larger than the sum of its proper divisors (33465106).

66440414 is a wasteful number, since it uses less digits than its factorization.

66440414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81634.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 66440414 is about 8151.0989443142. The cubic root of 66440414 is about 405.0209083348.

The spelling of 66440414 in words is "sixty-six million, four hundred forty thousand, four hundred fourteen".