261401818834 has 8 divisors (see below), whose sum is σ = 422264476620. Its totient is φ = 120646993296.

The previous prime is 261401818819. The next prime is 261401818883. The reversal of 261401818834 is 438818104162.

It can be written as a sum of positive squares in 2 ways, for example, as 191666213209 + 69735605625 = 437797^2 + 264075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×261401818834³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5026958029 + ... + 5026958080.

Almost surely, 2^261401818834 is an apocalyptic number.

261401818834 is a deficient number, since it is larger than the sum of its proper divisors (160862657786).

261401818834 is a wasteful number, since it uses less digits than its factorization.

261401818834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10053916124.

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 261401818834 in words is "two hundred sixty-one billion, four hundred one million, eight hundred eighteen thousand, eight hundred thirty-four".