261540886395 has 32 divisors (see below), whose sum is σ = 433319987520. Its totient is φ = 134546388480.

The previous prime is 261540886379. The next prime is 261540886423. The reversal of 261540886395 is 593688045162.

It is not a de Polignac number, because 261540886395 - 2⁴ = 261540886379 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149697 + ... + 738573.

It is an arithmetic number, because the mean of its divisors is an integer number (13541249610).

Almost surely, 2^261540886395 is an apocalyptic number.

261540886395 is a deficient number, since it is larger than the sum of its proper divisors (171779101125).

261540886395 is a wasteful number, since it uses less digits than its factorization.

261540886395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589935.

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 261540886395 in words is "two hundred sixty-one billion, five hundred forty million, eight hundred eighty-six thousand, three hundred ninety-five".