10661681 has 8 divisors (see below), whose sum is σ = 10965024. Its totient is φ = 10360480.

The previous prime is 10661671. The next prime is 10661683. The reversal of 10661681 is 18616601.

10661681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10661681 - 2¹⁸ = 10399537 is a prime.

It is a super-2 number, since 2×10661681² = 227342883491522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10661683) 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, 17870 + ... + 18456.

It is an arithmetic number, because the mean of its divisors is an integer number (1370628).

Almost surely, 2^10661681 is an apocalyptic number.

It is an amenable number.

10661681 is a deficient number, since it is larger than the sum of its proper divisors (303343).

10661681 is an equidigital number, since it uses as much as digits as its factorization.

10661681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 10661681 is about 3265.2229632906. Note that the first 3 decimals coincide. The cubic root of 10661681 is about 220.0941814385.

The spelling of 10661681 in words is "ten million, six hundred sixty-one thousand, six hundred eighty-one".