6516660 has 48 divisors (see below), whose sum is σ = 18357696. Its totient is φ = 1727232.

The previous prime is 6516649. The next prime is 6516667. The reversal of 6516660 is 666156.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6516667) 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, 18607 + ... + 18953.

It is an arithmetic number, because the mean of its divisors is an integer number (382452).

Almost surely, 2^6516660 is an apocalyptic number.

6516660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6516660 is an abundant number, since it is smaller than the sum of its proper divisors (11841036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6516660 is a wasteful number, since it uses less digits than its factorization.

6516660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6516660 is about 2552.7749607045. The cubic root of 6516660 is about 186.7848670312.

The spelling of 6516660 in words is "six million, five hundred sixteen thousand, six hundred sixty".