66846561 has 8 divisors (see below), whose sum is σ = 90257280. Its totient is φ = 44000112.

The previous prime is 66846557. The next prime is 66846569. The reversal of 66846561 is 16564866.

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

It is not a de Polignac number, because 66846561 - 2² = 66846557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66846569) 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, 140790 + ... + 141263.

It is an arithmetic number, because the mean of its divisors is an integer number (11282160).

Almost surely, 2^66846561 is an apocalyptic number.

It is an amenable number.

66846561 is a deficient number, since it is larger than the sum of its proper divisors (23410719).

66846561 is a wasteful number, since it uses less digits than its factorization.

66846561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282135.

The product of its digits is 207360, while the sum is 42.

The square root of 66846561 is about 8175.9746208021. The cubic root of 66846561 is about 405.8445233668.

The spelling of 66846561 in words is "sixty-six million, eight hundred forty-six thousand, five hundred sixty-one".