6650581 has 4 divisors (see below), whose sum is σ = 7600672. Its totient is φ = 5700492.

The previous prime is 6650561. The next prime is 6650591. The reversal of 6650581 is 1850566.

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 not a de Polignac number, because 6650581 - 2¹⁷ = 6519509 is a prime.

It is a super-2 number, since 2×6650581² = 88460455275122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650521) 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, 475035 + ... + 475048.

It is an arithmetic number, because the mean of its divisors is an integer number (1900168).

Almost surely, 2^6650581 is an apocalyptic number.

It is an amenable number.

6650581 is a deficient number, since it is larger than the sum of its proper divisors (950091).

6650581 is an equidigital number, since it uses as much as digits as its factorization.

6650581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950090.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 6650581 is about 2578.8720402533. The cubic root of 6650581 is about 188.0557119480.

The spelling of 6650581 in words is "six million, six hundred fifty thousand, five hundred eighty-one".