10661658 has 32 divisors (see below), whose sum is σ = 24630144. Its totient is φ = 3013632.

The previous prime is 10661653. The next prime is 10661671. The reversal of 10661658 is 85616601.

10661658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×10661658² = 227341902617928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2766 + ... + 5382.

It is an arithmetic number, because the mean of its divisors is an integer number (769692).

Almost surely, 2^10661658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10661658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12315072).

10661658 is an abundant number, since it is smaller than the sum of its proper divisors (13968486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10661658 is a wasteful number, since it uses less digits than its factorization.

10661658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 10661658 is about 3265.2194413240. The cubic root of 10661658 is about 220.0940231717.

The spelling of 10661658 in words is "ten million, six hundred sixty-one thousand, six hundred fifty-eight".