66415441 has 4 divisors (see below), whose sum is σ = 66473712. Its totient is φ = 66357172.

The previous prime is 66415373. The next prime is 66415463. The reversal of 66415441 is 14451466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66415441 is a prime.

It is a super-3 number, since 3×66415441³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66415541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27391 + ... + 29716.

It is an arithmetic number, because the mean of its divisors is an integer number (16618428).

Almost surely, 2^66415441 is an apocalyptic number.

It is an amenable number.

66415441 is a deficient number, since it is larger than the sum of its proper divisors (58271).

66415441 is a wasteful number, since it uses less digits than its factorization.

66415441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58270.

The product of its digits is 11520, while the sum is 31.

The square root of 66415441 is about 8149.5669210087. The cubic root of 66415441 is about 404.9701568215.

The spelling of 66415441 in words is "sixty-six million, four hundred fifteen thousand, four hundred forty-one".