66603306636 has 36 divisors (see below), whose sum is σ = 171211895400. Its totient is φ = 21824811648.

The previous prime is 66603306607. The next prime is 66603306641. The reversal of 66603306636 is 63660330666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 66603306591 and 66603306600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15676621 + ... + 15680868.

Almost surely, 2^66603306636 is an apocalyptic number.

It is an amenable number.

66603306636 is an abundant number, since it is smaller than the sum of its proper divisors (104608588764).

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

66603306636 is a wasteful number, since it uses less digits than its factorization.

66603306636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31357558 (or 31357553 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 45.

The spelling of 66603306636 in words is "sixty-six billion, six hundred three million, three hundred six thousand, six hundred thirty-six".