66542064 has 20 divisors (see below), whose sum is σ = 171900456. Its totient is φ = 22180672.

The previous prime is 66542053. The next prime is 66542093. The reversal of 66542064 is 46024566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693099 + ... + 693194.

Almost surely, 2^66542064 is an apocalyptic number.

It is an amenable number.

66542064 is an abundant number, since it is smaller than the sum of its proper divisors (105358392).

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

66542064 is a wasteful number, since it uses less digits than its factorization.

66542064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386304 (or 1386298 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 66542064 is about 8157.3319167483. The cubic root of 66542064 is about 405.2273559600.

The spelling of 66542064 in words is "sixty-six million, five hundred forty-two thousand, sixty-four".