16661407 has 16 divisors (see below), whose sum is σ = 19998720. Its totient is φ = 13571712.

The previous prime is 16661401. The next prime is 16661417. The reversal of 16661407 is 70416661.

It is not a de Polignac number, because 16661407 - 2¹¹ = 16659359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661401) 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, 38263 + ... + 38695.

It is an arithmetic number, because the mean of its divisors is an integer number (1249920).

Almost surely, 2^16661407 is an apocalyptic number.

16661407 is a deficient number, since it is larger than the sum of its proper divisors (3337313).

16661407 is a wasteful number, since it uses less digits than its factorization.

16661407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 16661407 is about 4081.8386788309. The cubic root of 16661407 is about 255.4096044229.

The spelling of 16661407 in words is "sixteen million, six hundred sixty-one thousand, four hundred seven".