16557701 has 4 divisors (see below), whose sum is σ = 16838400. Its totient is φ = 16277004.

The previous prime is 16557661. The next prime is 16557707. The reversal of 16557701 is 10775561.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16557701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140261 + ... + 140378.

It is an arithmetic number, because the mean of its divisors is an integer number (4209600).

Almost surely, 2^16557701 is an apocalyptic number.

It is an amenable number.

16557701 is a deficient number, since it is larger than the sum of its proper divisors (280699).

16557701 is an equidigital number, since it uses as much as digits as its factorization.

16557701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280698.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 16557701 is about 4069.1155058563. The cubic root of 16557701 is about 254.8785837459.

The spelling of 16557701 in words is "sixteen million, five hundred fifty-seven thousand, seven hundred one".