6537645 has 32 divisors (see below), whose sum is σ = 11788800. Its totient is φ = 3436992.

The previous prime is 6537611. The next prime is 6537649. The reversal of 6537645 is 5467356.

6537645 is a `hidden beast` number, since 6 + 5 + 3 + 7 + 645 = 666.

6537645 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6537645 - 2¹⁵ = 6504877 is a prime.

It is a super-3 number, since 3×6537645³ (a number of 21 digits) contains 333 as substring.

Its product of digits (75600) is a multiple of the sum of its prime divisors (700).

It is a Curzon number.

6537645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6537649) 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, 10359 + ... + 10971.

It is an arithmetic number, because the mean of its divisors is an integer number (368400).

Almost surely, 2^6537645 is an apocalyptic number.

It is an amenable number.

6537645 is a deficient number, since it is larger than the sum of its proper divisors (5251155).

6537645 is a wasteful number, since it uses less digits than its factorization.

6537645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 700 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 6537645 is about 2556.8818901154. The cubic root of 6537645 is about 186.9851475712.

The spelling of 6537645 in words is "six million, five hundred thirty-seven thousand, six hundred forty-five".