261178128954 has 24 divisors (see below), whose sum is σ = 584140332672. Its totient is φ = 84251009160.

The previous prime is 261178128941. The next prime is 261178128961. The reversal of 261178128954 is 459821871162.

261178128954 is a `hidden beast` number, since 2 + 611 + 7 + 8 + 12 + 8 + 9 + 5 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261178128954.

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, 234030024 + ... + 234031139.

It is an arithmetic number, because the mean of its divisors is an integer number (24339180528).

Almost surely, 2^261178128954 is an apocalyptic number.

261178128954 is an abundant number, since it is smaller than the sum of its proper divisors (322962203718).

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

261178128954 is a wasteful number, since it uses less digits than its factorization.

261178128954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468061202 (or 468061199 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 261178128954 in words is "two hundred sixty-one billion, one hundred seventy-eight million, one hundred twenty-eight thousand, nine hundred fifty-four".