66673641 has 8 divisors (see below), whose sum is σ = 93577120. Its totient is φ = 42109632.

The previous prime is 66673631. The next prime is 66673657. The reversal of 66673641 is 14637666.

It is a happy number.

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

It is not a de Polignac number, because 66673641 - 2⁶ = 66673577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66673641.

It is not an unprimeable number, because it can be changed into a prime (66673631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 584800 + ... + 584913.

It is an arithmetic number, because the mean of its divisors is an integer number (11697140).

Almost surely, 2^66673641 is an apocalyptic number.

It is an amenable number.

66673641 is a deficient number, since it is larger than the sum of its proper divisors (26903479).

66673641 is a wasteful number, since it uses less digits than its factorization.

66673641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169735.

The product of its digits is 108864, while the sum is 39.

The square root of 66673641 is about 8165.3928870569. The cubic root of 66673641 is about 405.4942723132.

The spelling of 66673641 in words is "sixty-six million, six hundred seventy-three thousand, six hundred forty-one".