261358910208 has 108 divisors (see below), whose sum is σ = 822067901928. Its totient is φ = 79199662080.

The previous prime is 261358910179. The next prime is 261358910209. The reversal of 261358910208 is 802019853162.

261358910208 is a `hidden beast` number, since 2 + 6 + 1 + 358 + 91 + 0 + 208 = 666.

It is a super-2 number, since 2×261358910208² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261358910209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5130885 + ... + 5181572.

Almost surely, 2^261358910208 is an apocalyptic number.

It is an amenable number.

261358910208 is an abundant number, since it is smaller than the sum of its proper divisors (560708991720).

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

261358910208 is a wasteful number, since it uses less digits than its factorization.

261358910208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312490 (or 10312473 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 261358910208 in words is "two hundred sixty-one billion, three hundred fifty-eight million, nine hundred ten thousand, two hundred eight".