16650401 has 8 divisors (see below), whose sum is σ = 16873920. Its totient is φ = 16428688.

The previous prime is 16650397. The next prime is 16650433. The reversal of 16650401 is 10405661.

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 16650401 - 2² = 16650397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16650451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29615 + ... + 30171.

It is an arithmetic number, because the mean of its divisors is an integer number (2109240).

Almost surely, 2^16650401 is an apocalyptic number.

It is an amenable number.

16650401 is a deficient number, since it is larger than the sum of its proper divisors (223519).

16650401 is a wasteful number, since it uses less digits than its factorization.

16650401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16650401 is about 4080.4902891687. The cubic root of 16650401 is about 255.3533535254.

The spelling of 16650401 in words is "sixteen million, six hundred fifty thousand, four hundred one".