66616602 has 64 divisors (see below), whose sum is σ = 152119296. Its totient is φ = 19293120.

The previous prime is 66616597. The next prime is 66616609. The reversal of 66616602 is 20661666.

It is not an unprimeable number, because it can be changed into a prime (66616609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127113 + ... + 127635.

It is an arithmetic number, because the mean of its divisors is an integer number (2376864).

Almost surely, 2^66616602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66616602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76059648).

66616602 is an abundant number, since it is smaller than the sum of its proper divisors (85502694).

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

66616602 is a wasteful number, since it uses less digits than its factorization.

66616602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66616602 is about 8161.8994112890. The cubic root of 66616602 is about 405.3786064810.

The spelling of 66616602 in words is "sixty-six million, six hundred sixteen thousand, six hundred two".