16033661 has 4 divisors (see below), whose sum is σ = 18324192. Its totient is φ = 13743132.

The previous prime is 16033637. The next prime is 16033673. The reversal of 16033661 is 16633061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16633061 = 691 ⋅24071.

It is a cyclic number.

It is not a de Polignac number, because 16033661 - 2¹⁴ = 16017277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16033661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16033681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145255 + ... + 1145268.

It is an arithmetic number, because the mean of its divisors is an integer number (4581048).

Almost surely, 2^16033661 is an apocalyptic number.

It is an amenable number.

16033661 is a deficient number, since it is larger than the sum of its proper divisors (2290531).

16033661 is an equidigital number, since it uses as much as digits as its factorization.

16033661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290530.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 16033661 is about 4004.2054143113. The cubic root of 16033661 is about 252.1607953795.

The spelling of 16033661 in words is "sixteen million, thirty-three thousand, six hundred sixty-one".