16561107 has 6 divisors (see below), whose sum is σ = 23921612. Its totient is φ = 11040732.

The previous prime is 16561093. The next prime is 16561147. The reversal of 16561107 is 70116561.

16561107 is a `hidden beast` number, since 1 + 656 + 1 + 1 + 0 + 7 = 666.

It is not a de Polignac number, because 16561107 - 2⁴ = 16561091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16561147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 920053 + ... + 920070.

Almost surely, 2^16561107 is an apocalyptic number.

16561107 is a deficient number, since it is larger than the sum of its proper divisors (7360505).

16561107 is a wasteful number, since it uses less digits than its factorization.

16561107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840129 (or 1840126 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 16561107 is about 4069.5340028067. The cubic root of 16561107 is about 254.8960591377.

Adding to 16561107 its reverse (70116561), we get a palindrome (86677668).

The spelling of 16561107 in words is "sixteen million, five hundred sixty-one thousand, one hundred seven".