6601645 has 8 divisors (see below), whose sum is σ = 8339040. Its totient is φ = 5003280.

The previous prime is 6601643. The next prime is 6601649. The reversal of 6601645 is 5461066.

6601645 = 808² + 809² + ... + 817².

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

It is not a de Polignac number, because 6601645 - 2¹ = 6601643 is a prime.

It is a super-3 number, since 3×6601645³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34651 + ... + 34840.

It is an arithmetic number, because the mean of its divisors is an integer number (1042380).

Almost surely, 2^6601645 is an apocalyptic number.

It is an amenable number.

6601645 is a deficient number, since it is larger than the sum of its proper divisors (1737395).

6601645 is a wasteful number, since it uses less digits than its factorization.

6601645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69515.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6601645 is about 2569.3666534771. The cubic root of 6601645 is about 187.5933283528.

The spelling of 6601645 in words is "six million, six hundred one thousand, six hundred forty-five".