16561007 has 8 divisors (see below), whose sum is σ = 17183040. Its totient is φ = 15949440.

The previous prime is 16561003. The next prime is 16561033. The reversal of 16561007 is 70016561.

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 16561007 - 2² = 16561003 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683 + ... + 5795.

It is an arithmetic number, because the mean of its divisors is an integer number (2147880).

Almost surely, 2^16561007 is an apocalyptic number.

16561007 is a deficient number, since it is larger than the sum of its proper divisors (622033).

16561007 is an equidigital number, since it uses as much as digits as its factorization.

16561007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 16561007 is about 4069.5217163691. The cubic root of 16561007 is about 254.8955460952.

Adding to 16561007 its reverse (70016561), we get a palindrome (86577568).

The spelling of 16561007 in words is "sixteen million, five hundred sixty-one thousand, seven".