66544686 has 32 divisors (see below), whose sum is σ = 159253920. Its totient is φ = 20475072.

The previous prime is 66544661. The next prime is 66544703. The reversal of 66544686 is 68644566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46695 + ... + 48098.

It is an arithmetic number, because the mean of its divisors is an integer number (4976685).

Almost surely, 2^66544686 is an apocalyptic number.

66544686 is an abundant number, since it is smaller than the sum of its proper divisors (92709234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66544686 is a wasteful number, since it uses less digits than its factorization.

66544686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94817 (or 94811 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 66544686 is about 8157.4926294787. The cubic root of 66544686 is about 405.2326783686.

The spelling of 66544686 in words is "sixty-six million, five hundred forty-four thousand, six hundred eighty-six".