16658642 has 64 divisors (see below), whose sum is σ = 34401024. Its totient is φ = 5840640.

The previous prime is 16658639. The next prime is 16658671. The reversal of 16658642 is 24685661.

It is a junction number, because it is equal to n+sod(n) for n = 16658596 and 16658605.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 106028 + ... + 106184.

It is an arithmetic number, because the mean of its divisors is an integer number (537516).

Almost surely, 2^16658642 is an apocalyptic number.

It is a pronic number, being equal to 4081×4082.

16658642 is an abundant number, since it is smaller than the sum of its proper divisors (17742382).

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

16658642 is a wasteful number, since it uses less digits than its factorization.

16658642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243.

The product of its digits is 69120, while the sum is 38.

The square root of 16658642 is about 4081.4999693740. The cubic root of 16658642 is about 255.3954750315.

It can be divided in two parts, 1665 and 8642, that multiplied together give a triangular number (14388930 = T₅₃₆₄).

The spelling of 16658642 in words is "sixteen million, six hundred fifty-eight thousand, six hundred forty-two".