16699661 has 8 divisors (see below), whose sum is σ = 19289664. Its totient is φ = 14288320.

The previous prime is 16699649. The next prime is 16699663.

16699661 is nontrivially palindromic in base 10.

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 16699661 - 2²² = 12505357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16699663) 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, 44465 + ... + 44838.

It is an arithmetic number, because the mean of its divisors is an integer number (2411208).

Almost surely, 2^16699661 is an apocalyptic number.

16699661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16699661 is a deficient number, since it is larger than the sum of its proper divisors (2590003).

16699661 is a wasteful number, since it uses less digits than its factorization.

16699661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89331.

The product of its digits is 104976, while the sum is 44.

The square root of 16699661 is about 4086.5218707356. The cubic root of 16699661 is about 255.6049254824.

The spelling of 16699661 in words is "sixteen million, six hundred ninety-nine thousand, six hundred sixty-one".