6690204664 has 64 divisors (see below), whose sum is σ = 14750799840. Its totient is φ = 2804482560.

The previous prime is 6690204593. The next prime is 6690204673. The reversal of 6690204664 is 4664020966.

It is a self number, because there is not a number n which added to its sum of digits gives 6690204664.

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, 1706034 + ... + 1709950.

Almost surely, 2^6690204664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6690204664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7375399920).

6690204664 is an abundant number, since it is smaller than the sum of its proper divisors (8060595176).

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

6690204664 is a wasteful number, since it uses less digits than its factorization.

6690204664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440 (or 5436 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 6690204664 is about 81793.6712955226. The cubic root of 6690204664 is about 1884.2844663718.

The spelling of 6690204664 in words is "six billion, six hundred ninety million, two hundred four thousand, six hundred sixty-four".