16201566 has 32 divisors (see below), whose sum is σ = 37900800. Its totient is φ = 5115960.

The previous prime is 16201543. The next prime is 16201567. The reversal of 16201566 is 66510261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16201567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6870 + ... + 8921.

It is an arithmetic number, because the mean of its divisors is an integer number (1184400).

Almost surely, 2^16201566 is an apocalyptic number.

16201566 is an abundant number, since it is smaller than the sum of its proper divisors (21699234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16201566 is a wasteful number, since it uses less digits than its factorization.

16201566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15821 (or 15815 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 16201566 is about 4025.1168927126. The cubic root of 16201566 is about 253.0379525103.

The spelling of 16201566 in words is "sixteen million, two hundred one thousand, five hundred sixty-six".