261909333381 has 8 divisors (see below), whose sum is σ = 349728270624. Its totient is φ = 174348309200.

The previous prime is 261909333359. The next prime is 261909333391. The reversal of 261909333381 is 183333909162.

261909333381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 261909333381 - 2⁵ = 261909333349 is a prime.

It is a super-2 number, since 2×261909333381² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261909333381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261909333311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64475895 + ... + 64479956.

It is an arithmetic number, because the mean of its divisors is an integer number (43716033828).

Almost surely, 2^261909333381 is an apocalyptic number.

It is an amenable number.

261909333381 is a deficient number, since it is larger than the sum of its proper divisors (87818937243).

261909333381 is a wasteful number, since it uses less digits than its factorization.

261909333381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128956531.

The product of its (nonzero) digits is 629856, while the sum is 48.

The spelling of 261909333381 in words is "two hundred sixty-one billion, nine hundred nine million, three hundred thirty-three thousand, three hundred eighty-one".