16625405 has 8 divisors (see below), whose sum is σ = 21124152. Its totient is φ = 12517888.

The previous prime is 16625387. The next prime is 16625407. The reversal of 16625405 is 50452661.

It can be written as a sum of positive squares in 4 ways, for example, as 7027801 + 9597604 = 2651^2 + 3098^2 .

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 16625405 - 2¹⁰ = 16624381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16625407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97712 + ... + 97881.

It is an arithmetic number, because the mean of its divisors is an integer number (2640519).

Almost surely, 2^16625405 is an apocalyptic number.

It is an amenable number.

16625405 is a deficient number, since it is larger than the sum of its proper divisors (4498747).

16625405 is a wasteful number, since it uses less digits than its factorization.

16625405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195615.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 16625405 is about 4077.4262715591. The cubic root of 16625405 is about 255.2255085743.

The spelling of 16625405 in words is "sixteen million, six hundred twenty-five thousand, four hundred five".