66603408 has 20 divisors (see below), whose sum is σ = 172058928. Its totient is φ = 22201120.

The previous prime is 66603403. The next prime is 66603451. The reversal of 66603408 is 80430666.

It is not an unprimeable number, because it can be changed into a prime (66603403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693738 + ... + 693833.

Almost surely, 2^66603408 is an apocalyptic number.

It is an amenable number.

66603408 is an abundant number, since it is smaller than the sum of its proper divisors (105455520).

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

66603408 is a wasteful number, since it uses less digits than its factorization.

66603408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387582 (or 1387576 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 66603408 is about 8161.0911035229. The cubic root of 66603408 is about 405.3518417891.

The spelling of 66603408 in words is "sixty-six million, six hundred three thousand, four hundred eight".