16665913 has 8 divisors (see below), whose sum is σ = 18315360. Its totient is φ = 15038880.

The previous prime is 16665911. The next prime is 16665949. The reversal of 16665913 is 31956661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16665913 - 2¹ = 16665911 is a prime.

It is a super-2 number, since 2×16665913² = 555505312247138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16665911) 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, 4023 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (2289420).

Almost surely, 2^16665913 is an apocalyptic number.

It is an amenable number.

16665913 is a deficient number, since it is larger than the sum of its proper divisors (1649447).

16665913 is a wasteful number, since it uses less digits than its factorization.

16665913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11207.

The product of its digits is 29160, while the sum is 37.

The square root of 16665913 is about 4082.3905986566. The cubic root of 16665913 is about 255.4326271273.

It can be divided in two parts, 16665 and 913, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 16665913 in words is "sixteen million, six hundred sixty-five thousand, nine hundred thirteen".