66603612 has 12 divisors (see below), whose sum is σ = 155408456. Its totient is φ = 22201200.

The previous prime is 66603601. The next prime is 66603613. The reversal of 66603612 is 21630666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66603612² = 8872082262893088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66603612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66603613) 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, 2775139 + ... + 2775162.

Almost surely, 2^66603612 is an apocalyptic number.

It is an amenable number.

66603612 is an abundant number, since it is smaller than the sum of its proper divisors (88804844).

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

66603612 is a wasteful number, since it uses less digits than its factorization.

66603612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550308 (or 5550306 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 66603612 is about 8161.1036018421. The cubic root of 66603612 is about 405.3522556403.

The spelling of 66603612 in words is "sixty-six million, six hundred three thousand, six hundred twelve".