66006616 has 16 divisors (see below), whose sum is σ = 133282800. Its totient is φ = 30464544.

The previous prime is 66006601. The next prime is 66006617. The reversal of 66006616 is 61660066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66006617) 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, 317236 + ... + 317443.

It is an arithmetic number, because the mean of its divisors is an integer number (8330175).

Almost surely, 2^66006616 is an apocalyptic number.

It is an amenable number.

66006616 is an abundant number, since it is smaller than the sum of its proper divisors (67276184).

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

66006616 is a wasteful number, since it uses less digits than its factorization.

66006616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634698 (or 634694 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66006616 is about 8124.4455810843. The cubic root of 66006616 is about 404.1375050676.

The spelling of 66006616 in words is "sixty-six million, six thousand, six hundred sixteen".