6662621 has 4 divisors (see below), whose sum is σ = 7614432. Its totient is φ = 5710812.

The previous prime is 6662581. The next prime is 6662633. The reversal of 6662621 is 1262666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6662621 - 2¹⁰ = 6661597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6662641) 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, 475895 + ... + 475908.

It is an arithmetic number, because the mean of its divisors is an integer number (1903608).

Almost surely, 2^6662621 is an apocalyptic number.

It is an amenable number.

6662621 is a deficient number, since it is larger than the sum of its proper divisors (951811).

6662621 is an equidigital number, since it uses as much as digits as its factorization.

6662621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951810.

The product of its digits is 5184, while the sum is 29.

The square root of 6662621 is about 2581.2053385967. The cubic root of 6662621 is about 188.1691268915.

The spelling of 6662621 in words is "six million, six hundred sixty-two thousand, six hundred twenty-one".