6641621 has 8 divisors (see below), whose sum is σ = 7990080. Its totient is φ = 5393088.

The previous prime is 6641587. The next prime is 6641633. The reversal of 6641621 is 1261466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6641621 - 2¹⁰ = 6640597 is a prime.

It is a super-2 number, since 2×6641621² = 88222259015282, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24836 + ... + 25101.

It is an arithmetic number, because the mean of its divisors is an integer number (998760).

Almost surely, 2^6641621 is an apocalyptic number.

It is an amenable number.

6641621 is a deficient number, since it is larger than the sum of its proper divisors (1348459).

6641621 is a wasteful number, since it uses less digits than its factorization.

6641621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49963.

The product of its digits is 1728, while the sum is 26.

The square root of 6641621 is about 2577.1342611513. The cubic root of 6641621 is about 187.9712212625.

The spelling of 6641621 in words is "six million, six hundred forty-one thousand, six hundred twenty-one".