66738606 has 16 divisors (see below), whose sum is σ = 145611648. Its totient is φ = 20223800.

The previous prime is 66738589. The next prime is 66738613. The reversal of 66738606 is 60683766.

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 7 ways as a sum of consecutive naturals, for example, 505530 + ... + 505661.

It is an arithmetic number, because the mean of its divisors is an integer number (9100728).

Almost surely, 2^66738606 is an apocalyptic number.

66738606 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66738606 is an abundant number, since it is smaller than the sum of its proper divisors (78873042).

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

66738606 is a wasteful number, since it uses less digits than its factorization.

66738606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011207.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 66738606 is about 8169.3699879489. The cubic root of 66738606 is about 405.6259304602.

The spelling of 66738606 in words is "sixty-six million, seven hundred thirty-eight thousand, six hundred six".