261102664206 has 24 divisors (see below), whose sum is σ = 566636392920. Its totient is φ = 86893613136.

The previous prime is 261102664189. The next prime is 261102664211. The reversal of 261102664206 is 602466201162.

261102664206 is a `hidden beast` number, since 2 + 6 + 1 + 1 + 0 + 2 + 6 + 642 + 0 + 6 = 666.

It is a super-2 number, since 2×261102664206² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11705905 + ... + 11728188.

It is an arithmetic number, because the mean of its divisors is an integer number (23609849705).

Almost surely, 2^261102664206 is an apocalyptic number.

261102664206 is an abundant number, since it is smaller than the sum of its proper divisors (305533728714).

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

261102664206 is a wasteful number, since it uses less digits than its factorization.

261102664206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23434720 (or 23434717 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 261102664206 its reverse (602466201162), we get a palindrome (863568865368).

The spelling of 261102664206 in words is "two hundred sixty-one billion, one hundred two million, six hundred sixty-four thousand, two hundred six".