66708654 has 16 divisors (see below), whose sum is σ = 134642640. Its totient is φ = 22032000.

The previous prime is 66708643. The next prime is 66708659. The reversal of 66708654 is 45680766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66708659) 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 7 ways as a sum of consecutive naturals, for example, 50347 + ... + 51654.

It is an arithmetic number, because the mean of its divisors is an integer number (8415165).

Almost surely, 2^66708654 is an apocalyptic number.

66708654 is an abundant number, since it is smaller than the sum of its proper divisors (67933986).

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

66708654 is a wasteful number, since it uses less digits than its factorization.

66708654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102115.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 66708654 is about 8167.5365931228. The cubic root of 66708654 is about 405.5652403211.

The spelling of 66708654 in words is "sixty-six million, seven hundred eight thousand, six hundred fifty-four".