16556901 has 4 divisors (see below), whose sum is σ = 22075872. Its totient is φ = 11037932.

The previous prime is 16556879. The next prime is 16556927. The reversal of 16556901 is 10965561.

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 not a de Polignac number, because 16556901 - 2¹⁵ = 16524133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506901) 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, 2759481 + ... + 2759486.

It is an arithmetic number, because the mean of its divisors is an integer number (5518968).

Almost surely, 2^16556901 is an apocalyptic number.

It is an amenable number.

16556901 is a deficient number, since it is larger than the sum of its proper divisors (5518971).

16556901 is an equidigital number, since it uses as much as digits as its factorization.

16556901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518970.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 16556901 is about 4069.0172032077. The cubic root of 16556901 is about 254.8744787849.

The spelling of 16556901 in words is "sixteen million, five hundred fifty-six thousand, nine hundred one".