16656601 has 8 divisors (see below), whose sum is σ = 18054344. Its totient is φ = 15275520.

The previous prime is 16656593. The next prime is 16656631. The reversal of 16656601 is 10665661.

It can be written as a sum of positive squares in 4 ways, for example, as 10201 + 16646400 = 101^2 + 4080^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16656601 - 2³ = 16656593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16656631) 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, 2040 + ... + 6121.

It is an arithmetic number, because the mean of its divisors is an integer number (2256793).

Almost surely, 2^16656601 is an apocalyptic number.

16656601 is the 2041-st decagonal number.

It is an amenable number.

16656601 is a deficient number, since it is larger than the sum of its proper divisors (1397743).

16656601 is a wasteful number, since it uses less digits than its factorization.

16656601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8331.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 16656601 is about 4081.2499310873. The cubic root of 16656601 is about 255.3850443402.

It can be divided in two parts, 1665660 and 1, that added together give a palindrome (1665661).

The spelling of 16656601 in words is "sixteen million, six hundred fifty-six thousand, six hundred one".