10661581 has 8 divisors (see below), whose sum is σ = 12714624. Its totient is φ = 8741040.

The previous prime is 10661569. The next prime is 10661591. The reversal of 10661581 is 18516601.

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

It is not a de Polignac number, because 10661581 - 2²³ = 2272973 is a prime.

It is a super-2 number, since 2×10661581² = 227338618839122, 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 (10661591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32950 + ... + 33271.

It is an arithmetic number, because the mean of its divisors is an integer number (1589328).

Almost surely, 2^10661581 is an apocalyptic number.

It is an amenable number.

10661581 is a deficient number, since it is larger than the sum of its proper divisors (2053043).

10661581 is an equidigital number, since it uses as much as digits as its factorization.

10661581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66251.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 10661581 is about 3265.2076503647. The cubic root of 10661581 is about 220.0934933204.

The spelling of 10661581 in words is "ten million, six hundred sixty-one thousand, five hundred eighty-one".