16618069 has 8 divisors (see below), whose sum is σ = 18380600. Its totient is φ = 14924736.

The previous prime is 16618051. The next prime is 16618093. The reversal of 16618069 is 96081661.

It can be written as a sum of positive squares in 4 ways, for example, as 7236100 + 9381969 = 2690^2 + 3063^2 .

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 16618069 - 2⁵ = 16618037 is a prime.

It is a super-2 number, since 2×16618069² = 552320434577522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16618009) 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, 16794 + ... + 17755.

It is an arithmetic number, because the mean of its divisors is an integer number (2297575).

Almost surely, 2^16618069 is an apocalyptic number.

It is an amenable number.

16618069 is a deficient number, since it is larger than the sum of its proper divisors (1762531).

16618069 is a wasteful number, since it uses less digits than its factorization.

16618069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34599.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16618069 is about 4076.5265852193. The cubic root of 16618069 is about 255.1879634280.

It can be divided in two parts, 1661 and 8069, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 16618069 in words is "sixteen million, six hundred eighteen thousand, sixty-nine".