16640206605 has 48 divisors (see below), whose sum is σ = 31475972736. Its totient is φ = 8065196160.

The previous prime is 16640206601. The next prime is 16640206613. The reversal of 16640206605 is 50660204661.

It is a happy number.

16640206605 is a `hidden beast` number, since 1 + 6 + 6 + 40 + 2 + 0 + 6 + 605 = 666.

It is not a de Polignac number, because 16640206605 - 2² = 16640206601 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16640206605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640206601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2859679 + ... + 2865491.

It is an arithmetic number, because the mean of its divisors is an integer number (655749432).

Almost surely, 2^16640206605 is an apocalyptic number.

16640206605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16640206605 is a deficient number, since it is larger than the sum of its proper divisors (14835766131).

16640206605 is a wasteful number, since it uses less digits than its factorization.

16640206605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11618 (or 11615 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 16640206605 in words is "sixteen billion, six hundred forty million, two hundred six thousand, six hundred five".