66708901 has 16 divisors (see below), whose sum is σ = 84236544. Its totient is φ = 51473664.

The previous prime is 66708883. The next prime is 66708911. The reversal of 66708901 is 10980766.

It is a cyclic number.

It is not a de Polignac number, because 66708901 - 2¹⁷ = 66577829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708911) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9450 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (5264784).

Almost surely, 2^66708901 is an apocalyptic number.

It is an amenable number.

66708901 is a deficient number, since it is larger than the sum of its proper divisors (17527643).

66708901 is a wasteful number, since it uses less digits than its factorization.

66708901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24420.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 66708901 is about 8167.5517139471. The cubic root of 66708901 is about 405.5657408783.

The spelling of 66708901 in words is "sixty-six million, seven hundred eight thousand, nine hundred one".