6651604 has 6 divisors (see below), whose sum is σ = 11640314. Its totient is φ = 3325800.

The previous prime is 6651587. The next prime is 6651647. The reversal of 6651604 is 4061566.

It can be written as a sum of positive squares in only one way, i.e., 4401604 + 2250000 = 2098^2 + 1500^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831447 + ... + 831454.

Almost surely, 2^6651604 is an apocalyptic number.

It is an amenable number.

6651604 is a deficient number, since it is larger than the sum of its proper divisors (4988710).

6651604 is a wasteful number, since it uses less digits than its factorization.

6651604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662905 (or 1662903 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6651604 is about 2579.0703751546. The cubic root of 6651604 is about 188.0653537688.

The spelling of 6651604 in words is "six million, six hundred fifty-one thousand, six hundred four".