16661290 has 16 divisors (see below), whose sum is σ = 31569120. Its totient is φ = 6313680.

The previous prime is 16661287. The next prime is 16661297. The reversal of 16661290 is 9216661.

It is not an unprimeable number, because it can be changed into a prime (16661297) 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, 43656 + ... + 44035.

It is an arithmetic number, because the mean of its divisors is an integer number (1973070).

Almost surely, 2^16661290 is an apocalyptic number.

16661290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16661290 is a deficient number, since it is larger than the sum of its proper divisors (14907830).

16661290 is a wasteful number, since it uses less digits than its factorization.

16661290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87717.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16661290 is about 4081.8243470292. The cubic root of 16661290 is about 255.4090065744.

The spelling of 16661290 in words is "sixteen million, six hundred sixty-one thousand, two hundred ninety".