208665093905 has 16 divisors (see below), whose sum is σ = 251684544384. Its totient is φ = 166076513280.

The previous prime is 208665093899. The next prime is 208665093907. The reversal of 208665093905 is 509390566802.

It is not a de Polignac number, because 208665093905 - 2⁶ = 208665093841 is a prime.

It is a super-2 number, since 2×208665093905² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208665093907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684977 + ... + 941553.

It is an arithmetic number, because the mean of its divisors is an integer number (15730284024).

Almost surely, 2^208665093905 is an apocalyptic number.

It is an amenable number.

208665093905 is a deficient number, since it is larger than the sum of its proper divisors (43019450479).

208665093905 is a wasteful number, since it uses less digits than its factorization.

208665093905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257416.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The spelling of 208665093905 in words is "two hundred eight billion, six hundred sixty-five million, ninety-three thousand, nine hundred five".