6541645 has 16 divisors (see below), whose sum is σ = 8672832. Its totient is φ = 4696960.

The previous prime is 6541621. The next prime is 6541663. The reversal of 6541645 is 5461456.

It is not a de Polignac number, because 6541645 - 2⁷ = 6541517 is a prime.

It is a super-3 number, since 3×6541645³ (a number of 21 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 3849 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (542052).

Almost surely, 2^6541645 is an apocalyptic number.

It is an amenable number.

6541645 is a deficient number, since it is larger than the sum of its proper divisors (2131187).

6541645 is a wasteful number, since it uses less digits than its factorization.

6541645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532.

The product of its digits is 14400, while the sum is 31.

The square root of 6541645 is about 2557.6639732381. The cubic root of 6541645 is about 187.0232748633.

The spelling of 6541645 in words is "six million, five hundred forty-one thousand, six hundred forty-five".