6651612 has 72 divisors (see below), whose sum is σ = 18992400. Its totient is φ = 2011680.

The previous prime is 6651587. The next prime is 6651647. The reversal of 6651612 is 2161566.

It is a happy number.

6651612 is a `hidden beast` number, since 6 + 651 + 6 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12814 + ... + 13322.

Almost surely, 2^6651612 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 6651612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9496200).

6651612 is an abundant number, since it is smaller than the sum of its proper divisors (12340788).

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

6651612 is a wasteful number, since it uses less digits than its factorization.

6651612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 525 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 6651612 is about 2579.0719261005. The cubic root of 6651612 is about 188.0654291652.

The spelling of 6651612 in words is "six million, six hundred fifty-one thousand, six hundred twelve".