16243661 has 8 divisors (see below), whose sum is σ = 18607680. Its totient is φ = 13890528.

The previous prime is 16243649. The next prime is 16243663. The reversal of 16243661 is 16634261.

It is a happy number.

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 16243661 - 2²² = 12049357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16243663) 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, 785 + ... + 5753.

It is an arithmetic number, because the mean of its divisors is an integer number (2325960).

Almost surely, 2^16243661 is an apocalyptic number.

It is an amenable number.

16243661 is a deficient number, since it is larger than the sum of its proper divisors (2364019).

16243661 is an equidigital number, since it uses as much as digits as its factorization.

16243661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5443.

The product of its digits is 5184, while the sum is 29.

The square root of 16243661 is about 4030.3425412736. The cubic root of 16243661 is about 253.2569111973.

The spelling of 16243661 in words is "sixteen million, two hundred forty-three thousand, six hundred sixty-one".