6691664 has 20 divisors (see below), whose sum is σ = 14817504. Its totient is φ = 2867808.

The previous prime is 6691661. The next prime is 6691687. The reversal of 6691664 is 4661966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29762 + ... + 29985.

Almost surely, 2^6691664 is an apocalyptic number.

It is an amenable number.

6691664 is an abundant number, since it is smaller than the sum of its proper divisors (8125840).

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

6691664 is a wasteful number, since it uses less digits than its factorization.

6691664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59762 (or 59756 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 6691664 is about 2586.8250810598. The cubic root of 6691664 is about 188.4421462890.

The spelling of 6691664 in words is "six million, six hundred ninety-one thousand, six hundred sixty-four".