208665093906 has 12 divisors (see below), whose sum is σ = 452107703502. Its totient is φ = 69555031296.

The previous prime is 208665093899. The next prime is 208665093907. The reversal of 208665093906 is 609390566802.

208665093906 is a `hidden beast` number, since 20 + 86 + 6 + 509 + 39 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 197010811881 + 11654282025 = 443859^2 + 107955^2 .

It is a super-2 number, since 2×208665093906² (a number of 23 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 5796252591 + ... + 5796252626.

Almost surely, 2^208665093906 is an apocalyptic number.

208665093906 is an abundant number, since it is smaller than the sum of its proper divisors (243442609596).

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

208665093906 is a wasteful number, since it uses less digits than its factorization.

208665093906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11592505225 (or 11592505222 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 208665093906 in words is "two hundred eight billion, six hundred sixty-five million, ninety-three thousand, nine hundred six".