16661061 has 12 divisors (see below), whose sum is σ = 24305580. Its totient is φ = 10996800.

The previous prime is 16660979. The next prime is 16661083. The reversal of 16661061 is 16016661.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 3744225 = 3594^2 + 1935^2 .

It is not a de Polignac number, because 16661061 - 2⁷ = 16660933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8256 + ... + 10073.

It is an arithmetic number, because the mean of its divisors is an integer number (2025465).

Almost surely, 2^16661061 is an apocalyptic number.

It is an amenable number.

16661061 is a deficient number, since it is larger than the sum of its proper divisors (7644519).

16661061 is a wasteful number, since it uses less digits than its factorization.

16661061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18436 (or 18433 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 16661061 is about 4081.7962957502. The cubic root of 16661061 is about 255.4078364183.

The spelling of 16661061 in words is "sixteen million, six hundred sixty-one thousand, sixty-one".