10661690 has 16 divisors (see below), whose sum is σ = 20667528. Its totient is φ = 3936576.

The previous prime is 10661687. The next prime is 10661699. The reversal of 10661690 is 9616601.

It can be written as a sum of positive squares in 4 ways, for example, as 2647129 + 8014561 = 1627^2 + 2831^2 .

It is a super-2 number, since 2×10661690² = 227343267312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661699) 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, 40877 + ... + 41136.

Almost surely, 2^10661690 is an apocalyptic number.

10661690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10661690 is a deficient number, since it is larger than the sum of its proper divisors (10005838).

10661690 is a wasteful number, since it uses less digits than its factorization.

10661690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82033.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 10661690 is about 3265.2243414504. The cubic root of 10661690 is about 220.0942433689.

The spelling of 10661690 in words is "ten million, six hundred sixty-one thousand, six hundred ninety".