66602645 has 8 divisors (see below), whose sum is σ = 81018456. Its totient is φ = 52551936.

The previous prime is 66602639. The next prime is 66602659. The reversal of 66602645 is 54620666.

It can be written as a sum of positive squares in 4 ways, for example, as 28976689 + 37625956 = 5383^2 + 6134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66602645 - 2¹² = 66598549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90872 + ... + 91601.

It is an arithmetic number, because the mean of its divisors is an integer number (10127307).

Almost surely, 2^66602645 is an apocalyptic number.

It is an amenable number.

66602645 is a deficient number, since it is larger than the sum of its proper divisors (14415811).

66602645 is a wasteful number, since it uses less digits than its factorization.

66602645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182551.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 66602645 is about 8161.0443571886. The cubic root of 66602645 is about 405.3502938972.

The spelling of 66602645 in words is "sixty-six million, six hundred two thousand, six hundred forty-five".