66608384 has 18 divisors (see below), whose sum is σ = 132957090. Its totient is φ = 33304064.

The previous prime is 66608369. The next prime is 66608393. The reversal of 66608384 is 48380666.

It can be written as a sum of positive squares in only one way, i.e., 60217600 + 6390784 = 7760^2 + 2528^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129839 + ... + 130350.

It is an arithmetic number, because the mean of its divisors is an integer number (7386505).

Almost surely, 2^66608384 is an apocalyptic number.

66608384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66608384 is a deficient number, since it is larger than the sum of its proper divisors (66348706).

66608384 is an equidigital number, since it uses as much as digits as its factorization.

66608384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260205 (or 260191 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 66608384 is about 8161.3959590256. The cubic root of 66608384 is about 405.3619362702.

The spelling of 66608384 in words is "sixty-six million, six hundred eight thousand, three hundred eighty-four".