16657201 has 4 divisors (see below), whose sum is σ = 18171504. Its totient is φ = 15142900.

The previous prime is 16657183. The next prime is 16657219. The reversal of 16657201 is 10275661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10275661 = 11 ⋅934151.

It is an interprime number because it is at equal distance from previous prime (16657183) and next prime (16657219).

It is a cyclic number.

It is not a de Polignac number, because 16657201 - 2⁵ = 16657169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16657201.

It is not an unprimeable number, because it can be changed into a prime (16657001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757135 + ... + 757156.

It is an arithmetic number, because the mean of its divisors is an integer number (4542876).

Almost surely, 2^16657201 is an apocalyptic number.

16657201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16657201 is a deficient number, since it is larger than the sum of its proper divisors (1514303).

16657201 is a wasteful number, since it uses less digits than its factorization.

16657201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514302.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 16657201 is about 4081.3234373179. The cubic root of 16657201 is about 255.3881107759.

The spelling of 16657201 in words is "sixteen million, six hundred fifty-seven thousand, two hundred one".