6661535 has 16 divisors (see below), whose sum is σ = 8553600. Its totient is φ = 4962816.

The previous prime is 6661511. The next prime is 6661547. The reversal of 6661535 is 5351666.

It is a cyclic number.

It is not a de Polignac number, because 6661535 - 2⁸ = 6661279 is a prime.

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, 8906 + ... + 9624.

It is an arithmetic number, because the mean of its divisors is an integer number (534600).

Almost surely, 2^6661535 is an apocalyptic number.

6661535 is a deficient number, since it is larger than the sum of its proper divisors (1892065).

6661535 is a wasteful number, since it uses less digits than its factorization.

6661535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850.

The product of its digits is 16200, while the sum is 32.

The square root of 6661535 is about 2580.9949631876. The cubic root of 6661535 is about 188.1589025481.

The spelling of 6661535 in words is "six million, six hundred sixty-one thousand, five hundred thirty-five".