6542661 has 16 divisors (see below), whose sum is σ = 9100800. Its totient is φ = 4175808.

The previous prime is 6542647. The next prime is 6542681. The reversal of 6542661 is 1662456.

It is not a de Polignac number, because 6542661 - 2¹⁴ = 6526277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13420 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (568800).

Almost surely, 2^6542661 is an apocalyptic number.

It is an amenable number.

6542661 is a deficient number, since it is larger than the sum of its proper divisors (2558139).

6542661 is a wasteful number, since it uses less digits than its factorization.

6542661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668.

The product of its digits is 8640, while the sum is 30.

The square root of 6542661 is about 2557.8625842684. The cubic root of 6542661 is about 187.0329567201.

The spelling of 6542661 in words is "six million, five hundred forty-two thousand, six hundred sixty-one".